在平面直角坐标系xoy中，动点M到定点F（0，14）的距离比它到x轴的距离大14，设动点M的轨迹是曲线E．（1）

发布时间：2019-09-08 22:12:12

推荐回答

（1）由已知，动点M到定点F（0，14）的距离比它到x轴的距离大14，∴动点M到定点F（0，14）的距离等于它到定直线x=-14的距离，…（2分）∴动点M的轨迹曲线E是顶点在原点，焦点为F（0，14）的抛物线和点（0，-14）…（4分）∴曲线E的轨迹方程为x2=y和x=0（y＜0）．…（6分）（2）由x-y+2=0x2=y，解得x=-1y=1或x=2y=4 …（8分）即A（-1，1），B（2，4）设过原点与点A、B的圆C的方程为x2+y2+Dx+Ey+F=0，则F=01+1-D+E+F=04+16+2D+4E+F=0，解得本回答由提问者推荐举报| 答案纠错 | 评论赞0 踩0

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Daily.init({"date":"2018.06.24","term":"1761","list":[{"id":"126909","title":"\u53e4\u4ee3\u519b\u961f\u6253\u4ed7\u4e3a\u4f55\u79bb\u4e0d\u5f00\u65d7\u5e1c\uff1f\u4e2d\u56fd\u53e4\u4ee3\u519b\u961f\u8ddf\u7f57\u9a6c\u519b\u56e2\u8c01\u66f4\u5f3a\uff1f","mt_img_src":"https:\/\/gss0.baidu.\/8_BXsjip0QIZ8tyhnq\/timg?wh_rate=0&wapiknow&quality=100&size=w250&sec=0&di=412bceebf73792ba8029d0af7a36e3ab&src=http%3A%2F%2Fiknow02.bosstatic.bdimg.%2Fzhidaoribao%252F2018%252F0624%252Ftop1.png"},{"id":"131749","title":"\u4f60\u77e5\u9053\u662f\u8c01\u53d1\u660e\u4e86\u4e16\u754c\u4e0a\u7b2c\u4e00\u53f0\u8ba1\u7b97\u673a\uff1f","mt_img_src":"https:\/\/gss0.baidu.\/8_BXsjip0QIZ8tyhnq\/timg?wh_rate=0&wapiknow&quality=100&size=w250&sec=0&di=ec7e4a563e2a5643efd5b4101ee6e9a7&src=http%3A%2F%2Ff.hiphotos.baidu.%2Fzhidao%2Fwh%253D800%252C450%253B%2Fsign%3D19f9e23bf7edab64742745c8c70683f7%2Fb3b7d0a20cf431ad7619dfc94736acaf2fdd9873.jpg"},{"id":"131736","title":"\u590f\u5929\u5230\u4e86\uff0c\u4f60\u7684\u5348\u7761\u7761\u5bf9\u4e86\u5417\uff1f","mt_img_src":"https:\/\/gss0.baidu.\/8_BXsjip0QIZ8tyhnq\/timg?wh_rate=0&wapiknow&quality=100&size=w250&sec=0&di=fca5139f440a4647894224a59848ea9d&src=http%3A%2F%2Fg.hiphotos.baidu.%2Fzhidao%2Fwh%253D800%252C450%253B%2Fsign%3Dd7a03cdbbc51f819f1700b42ea8466d9%2Fd4628535e5dde7117e5df906abefce1b9c1661b7.jpg"},{"id":"131468","title":"\u4ece2018\u5e74\u8d77\uff0c\u519c\u6c11\u6709\u4e86\u65b0\u8282\u65e5\uff011\u5206\u949f\u4e86\u89e3\u201c\u4e2d\u56fd\u519c\u6c11\u4e30\u6536\u8282\u201d","mt_img_src":"https:\/\/gss0.baidu.\/8_BXsjip0QIZ8tyhnq\/timg?wh_rate=0&wapiknow&quality=100&size=w250&sec=0&di=838d885c4f20620cfe986d5502a5c346&src=http%3A%2F%2Fc.hiphotos.baidu.%2Fzhidao%2Fwh%253D800%252C450%253B%2Fsign%3Df23ceebf40086e066afd3743323857c0%2Fbd315c6034a85edfc7148cad45540923dc5475a7.jpg"},{"id":"131555","title":"\u8ba9\u5b9d\u5b9d\u5403\u9971\u53c8\u5403\u597d\u7684\u79d8\u8bc0\uff0c\u5c31\u662f\u7ed9\u5b9d\u5b9d\u5403\u8fd9\u7c7b\u578b\u7684\u98df\u7269\uff01","mt_img_src":"https:\/\/gss0.baidu.\/8_BXsjip0QIZ8tyhnq\/timg?wh_rate=0&wapiknow&quality=100&size=w250&sec=0&di=ca9f8a8bbcf124f5cf9235284760c7c5&src=http%3A%2F%2Fe.hiphotos.baidu.%2Fzhidao%2Fwh%253D800%252C450%253B%2Fsign%3D85301480b40e7bec238f0be91f1e950c%2F0b55b319ebc4b745ff98b799c3fc1e178a821534.jpg"},{"id":"129595","title":"\u79d1\u5b66\u4e4b\u8c1c|\u8ba9\u5927\u8111\u900f\u660e\u7684\u79d1\u5b66\u5bb6","mt_img_src":"https:\/\/gss0.baidu.\/8_BXsjip0QIZ8tyhnq\/timg?wh_rate=0&wapiknow&quality=100&size=w250&sec=0&di=2d6f67843250d3310ac0a43bc97e507e&src=http%3A%2F%2Fd.hiphotos.baidu.%2Fzhidao%2Fwh%253D800%252C450%2Fsign%3Db2459f428613632715b8ca3ba1bf8cd8%2F34fae6cd7b899e51ac29398a4ea7d933c9950d8c.jpg"},{"id":"128297","title":"\u65e5\u672c\u6218\u56fd\u65f6\u4ee3\u7684\u201c\u5343\u4eba\u6740\u201d\uff01\u65e5\u5f0f\u7279\u79cd\u706b\u5668\u62b1\u5f0f\u5927\u7b52\u548c\u68d2\u706b\u77e2\u9274\u8d4f","mt_img_src":"https:\/\/gss0.baidu.\/8_BXsjip0QIZ8tyhnq\/timg?wh_rate=0&wapiknow&quality=100&size=w250&sec=0&di=bf6d0b9decc82864155de90a70d9b85b&src=http%3A%2F%2Fe.hiphotos.baidu.%2Fzhidao%2Fwh%253D800%252C450%2Fsign%3D056d244c7a094b36dbc713e593fc50ed%2F63d0f703918fa0ec3c3abe9e2a9759ee3c6ddba0.jpg"}]}, '0'); }); }(); !function(){var F = (window.__IKNOW_GLOBAL__ || window).F;var require = (window.__IKNOW_GLOBAL__ || window).require; require.async(['question:widget/user/nologin-daily/nologin-daily']); }(); !function(){var F = (window.__IKNOW_GLOBAL__ || window).F;var require = (window.__IKNOW_GLOBAL__ || window).require;require.async(['mon:widget/js/logic/union/union'], function(union){ // args[2, 3]自定义定向使用, mon:union中有限制只能调用一次; union('968278', 'union-asplu', { 'zdquery' : '', 'zdclassid' : '83', 'zhidaoqid' : '425200883462623732' }); }); }(); !function(){var F = (window.__IKNOW_GLOBAL__ || window).F;var require = (window.__IKNOW_GLOBAL__ || window).require; require.async(['question:widget/ad-right/ad-right']); }(); !function(){var F = (window.__IKNOW_GLOBAL__ || window).F;var require = (window.__IKNOW_GLOBAL__ || window).require; require.async(['mon:widget/js/util/tangram/tangram','question:widget/link-union/link-union'], function($, LU) { LU.init({ newbest: {"1999633191":{"id":1999633191,"qid":"425200883462623732","encode_qid":"425200883462623732","threadId":"7998532765","deleted":0,"isBest":1,"isHighQuality":0,"isExcellent":0,"isRemend":0,"isSpecial":0,"c_timestamp":1415411302,"createTime":"2014-11-08","remendCanceled":0,"hasImage":0,"hasComment":0,"isFromHelp":0,"isFromWap":0,"valueNum":0,"valueBadNum":0,"refContent":"","content":null,"contentText":null,"mapUrl":"","contentRich":null,"contentRichOrig":null,"imgUrl":null,"fileName":[],"fileAttrs":[],"bit_pack":{"is_remend":0,"wap_flag":0,"is_pic_contained":0,"media_flag":0,"help_flag":0,"anonymous":0,"is_really_anonymous":0,"level_new":1,"ment_flag":0,"in_mis":0,"auto_remend":0,"content_rich_flag":1,"prior_flag":1,"hidden_flag":0,"rec_canceled_flag":0,"mis_flag":0,"file_flag":0,"read_flag":0,"is_challenge":0,"ikaudio_flag":0,"mavin_flag":0,"authentic_state":0,"is_pulsory_best":0},"ext_pack":{"submit_from":"ik_import_qa","mode_qtype":0,"mode_begintime":0,"ignore_spam":"15","op_uid":0,"mode_evaluate":1,"recTime":"1460743670"},"import_id":1576,"uscore":{"level":4,"sublevel":0,"good_rate":0,"icon_sysno":0,"sex":0},"inMis":0,"isHard":0,"value_rank":5898,"applyStatus":{"applyExcType":0,"applyNum":0},"area":1,"user":{"uid":518420125,"name":null,"imId":"9d76b0a2c9aa374545e61e","isAnonymous":0,"isUnLogin":0,"isCurrentUser":0,"ipNum":181389157,"isNoUserName":0,"iconType":6,"sex":1,"isAuth":0,"isExpert":0,"isExpertImport":0,"isUserAdmin":0,"isFamous":0,"isMaster":0,"isFromTorch":0,"isOpenApp":0,"encodeUid":"9d764069236f25705e79e61e","gradeIndex":4,"grAnswerNum":56,"goodRate":70,"selfDefinedPhoto":0,"isAppAuth":0},"oldQid":878649789,"relateWords":[],"type":"best"}}, remend: null, answerList: null, sid: '', askQid: '425200883462623732' }); $.getScript("https://gh.bdstatic./static/gh/js/ll/m_word.js"); }); }(); !function(){var F = (window.__IKNOW_GLOBAL__ || window).F;var require = (window.__IKNOW_GLOBAL__ || window).require;require.async(['question:widget/image-scale/image-scale'], function(imageScale){ imageScale.init('.ikqb_img'); }); }(); !function(){var F = (window.__IKNOW_GLOBAL__ || window).F;var require = (window.__IKNOW_GLOBAL__ || window).require;require.async(['question:widget/mask/mask.es'], function(mask) { mask.init(); }); }(); !function(){var F = (window.__IKNOW_GLOBAL__ || window).F;var require = (window.__IKNOW_GLOBAL__ || window).require;require.async(['question:widget/view/accusation/accusation.es'], function(accusation) { accusation.init(); }); }(); !function(){var F = (window.__IKNOW_GLOBAL__ || window).F;var require = (window.__IKNOW_GLOBAL__ || window).require; require('mon:widget/js/logic/ie-prompt/ie-prompt'); require.async(['mon:widget/footer-new/footer-new'], function(footer) { footer.init(); }); }(); !function(){var F = (window.__IKNOW_GLOBAL__ || window).F;var require = (window.__IKNOW_GLOBAL__ || window).require;require.async(['mon:widget/js/util/tangram/tangram','mon:widget/js/util/log/log','mon:widget/js/util/event/event','mon:widget/js/ui/dialog/dialog','question:widget/js/file/file','question:widget/js/video/video','mon:widget/js/ui/tip/tip','question:widget/ask/share/share','mon:widget/js/util/https/https','mon:widget/js/util/store/store','question:widget/mavin-statistics/mavin-statistics'], function($, log, ec, Dialog, File, Video, Tip, share, https, store, mavinStatistics){ // 打点QB页用户可操作时间 alog && alog('speed.set', 'drt', +new Date); require.async(['question:widget/js/accuse/accuse'], function(accuse){ accuse.init({ target: '#wgt-ask .accuse-area', response: 'wgt-ask', accusetype: 0 }); if (!$.isEmptyObject(F.context('answers'))){ accuse.init({ target: '.wgt-best .accuse-area',response: 'wgt-best', accusetype: 1 }); accuse.init({ target: '#wgt-answers .accuse-area', response: 'answer', accusetype: 1 }); } }); log.addKey({ qbleftdown: $('.qbleftdown').find('li').size(), qbrightdown:$('.qbrightdown').find('.r').size() }); if ( $( '.qbleftdown a' ).size() ) { log.addKey({ ec_ads: '2', ec_ads_count: $('.qbleftdown').find('a.ec_ad_title, span.ec_qad_title, a.EC_ad_title').size() }); $('.qbleftdown a').click(function(){ var $parent = $( this ).parent(); if ( this.id || this.className == 'EC_ad_title' || $(this).hasClass('ec_ik220_adtitle') || $(this).hasClass('ec_ik220_desc') || $parent.hasClass( 'EC_ads_answer' ) || this.className == 'EC_ads_listurl' || this.className == 'ec_ad_title' || $parent.hasClass('ec_qad_title') || $parent.hasClass('ec_qad_answerer') ) { log.send({ type: 2014, evtType: 'click', pos: 'ec_ads' }); } }); } require.async(['question:widget/js/card/card'], function(card){ $('.user-name').each(function(index, item){ new card({ target: item, type: 'normal' }); }); $('.mavin-name').each(function(index, item){ new card({target: item, type: 'mavin' }); }); $('.opendev-name').each(function(index, item){ new card({target: item, type: 'opendev'}); }); $('.uadmin-a').each(function(index, item) { new card({target: item, type: 'uadminIcon'}); }); $('.business-name').each(function(index, item){ new card({target: item, type: 'business' }); }); $('.quality-business-name').each(function (index, item) { new card({target: item, type: 'qbusiness'}); }); }); $('.fixed-ask-e').click(function(e){ e.preventDefault(); var username = $(this).attr('username'); require.async(['mon:widget/js/logic/iask/iask'], function(fixedAsk){ fixedAsk(username); }); }); $('.replyask-shrink a').click(function(e){ e.preventDefault(); var flag = this.innerHTML.indexOf('更多追问') != -1; var dl = $(this).html( flag ? '收起追问' : '更多追问' ).parent().prevAll('.replyask'); $($.makeArray(dl).reverse().slice(flag ? 0 : 3, dl.length)).css('display', flag ? 'block' : 'none'); }); $('.replyask-box').each(function (index, item) { if ($(item).find('.replyask-shrink').size() == 0) { if ($(item).find('.ask-supply').size() == 2) { // $(item).find('.replyask').last().find('.ask-supply-line').hide(); } if ($(item).find('.ask-supply').size() == 1) { // $(item).find('.ask-supply-line').hide(); } // $(item).find('.ask-supply-line').last().hide(); } }); if($('.thunder-wrap').size()){ require.async(['question:widget/js/thunder/thunder'], function(thunder){ $(function(){ thunder.init(); }); }); } $.each(F.context('answers'), function(index, item){ if(item.user){ if (item.user.isFromBusiness > 0) { $.ajax({ url: '/business/submit/onbusinessbrowse', type: 'POST', dataType: 'json', data: { businessId: item.user.business.businessId, page: '1', token: F.context('businessToken'), qid: F.context('page')['qid'] } }) .done(function () { }) .fail(function () { }); } } }); // 行家pv统计 mavinStatistics.scan(); $('.qbrightdown a').click(function(){ log.send({ type: 2014, qid: F.context('page')['qid'], area: 'medical-right-txt-ads', action: 'click' }); }); if($('ikaudio').size()){ log.addKey({ 'audio' : 1 }); require.async(['question:widget/js/audio/audio'], function(audio){ audio.init(); }); } require.async(['question:widget/js/ment/ment'], function(m){ m.getCount(); }); $('.remend-text, .best-text, .answer-text, .replyask-content').each(function(i, answerText){ $(answerText).find('pre[t="code"]').each(function(i, pre){ var loadSyntax = function(){ SyntaxHighlighter(pre); }; $(pre).text($(pre).html($(pre).html().replace(//ig, '##IK_LINEBREAK##')).text().split('##IK_LINEBREAK##').join('\n')); $(pre).addClass('brush:'+$(pre).attr('l')+';toolbar:false;'); if (window.SyntaxHighlighter) { SyntaxHighlighter.highlight(pre); $(answerText).find('.syntaxhighlighter .code .line').each(function(index, line){ $(answerText).find('.syntaxhighlighter .gutter .line').eq(index).height($(line).height()); }); } else { var sioUrl = https.autoTrans('http://img.iknow.bdimg./libs/SyntaxHighlighter/shCore.min.js'); $.sio(sioUrl).callByBrowser(function(){ SyntaxHighlighter.defaults['quick-code'] = false; SyntaxHighlighter.config.stripBrs = true; SyntaxHighlighter.highlight(pre); $(answerText).find('.syntaxhighlighter .code .line').each(function(index, line){ $(answerText).find('.syntaxhighlighter .gutter .line').eq(index).height($(line).height()); }); }); } }); $(answerText).find('ikvideo').each(function(i, video){ var id = 'VIDEO_' + $.id(), src = $(video).attr('src'), sid; var container = $('').attr('id', id).insertBefore($(video)); if (src.indexOf('v.baidu.') > -1 ) { container.html(''); return; } if (src.indexOf('youku') > -1 && (sid = src.match(/sid\/(.*?)[\?\/]/))) { if (sid[1]) { src = 'http://player.youku./player.php/sid/'+sid[1]+'/v.swf'; } } container.html(''); }); }); var scrollLogged = false; var middleLogged = false; var bottomLogged = false; $(document).on('scroll', function () { var docViewTop = $(window).scrollTop(); var docViewBottom = docViewTop + $(window).height(); var $cmsScroll = $('#cms-scroll'); if ($cmsScroll.length > 0) { var scrollElemTop = $cmsScroll.offset().top; if (!scrollLogged && (scrollElemTop > docViewTop && scrollElemTop < docViewBottom)) { scrollLogged = true; log.send({ area: 'quesion_right_scoll' }); } } var $cmsCompany = $('#cms-pany'); if ($cmsScroll.length > 0) { var middleElemTop = $cmsScroll.offset().top; if (!middleLogged && (middleElemTop > docViewTop && middleElemTop < docViewBottom)) { middleLogged = true; log.send({ area: 'question_middle_ads' }); } } var $knowledge = $('.knowledge'); if ($knowledge.length > 0) { var bottomElemTop = $knowledge.offset().top; if (!bottomLogged && (bottomElemTop > docViewTop && bottomElemTop < docViewBottom)) { bottomLogged = true; log.send({ area: 'question_knowledge' }); } } }); require.async(['mon:widget/js/ui/lazyload/lazyload'], function(lazyload){ $('.wgt-replyer-best .avatar-48 a, .wgt-replyer-best .avatar-66 a, .wgt-replyer-special .avatar-66 a,.wgt-replyer-best .avatar-69 a, .wgt-replyer-best .avatar-70 a, .wgt-replyer-best .avatar-66 a, #cms-pany a').lazyload(); }); $('.ikqb-map').each(function(index, item) { var ifreamObj = $("").attr({ frameborder: '0' ,width:"430" ,height:"310" ,style: 'display:none;' ,className: 'answer-map' }), tmpsrc = $(item).attr("map") || $(item).attr("src"); var iframeSrc = !/ueditor\/dialogs\/map/i.test(tmpsrc) ? '//zhidao.baidu./html/map' + tmpsrc.replace(/^iknow/i, '') : tmpsrc; ifreamObj.attr('src', iframeSrc); $(item).before(ifreamObj).remove(); ifreamObj.after( $("

").addClass('f-aid').html("本数据来源于百度地图，最终结果以百度地图最新数据为准。") ).show(); }); log.addKey({ qb_struct_type: '' }); if ($('video.edui-faked-video').size() > 0) { Video.init(); } require.async(['mon:widget/js/logic/ut/ut'], function(UT){ UT.start(['userbar','header','wgt-ask','answer-editor','wgt-answers']); }); File.init(); logPV(); if (F.context('user')['isUserAdmin'] != '1'){ require.async(['question:widget/js/select-search/select-search'], function(A){ A.init(); }); } log.init({key:2014, query: 'body',action:'click'}); function logPV(){ var logOptions = { screen: parseInt($('body').height()/$(window).height()), cid: F.context('page')['cid'], view: F.context('page').isView, cidTop: F.context('page')['cidTop'], cidMid: F.context('page')['cidMid'], refer: document.referrer, adsEids: F.context('page').adsAll.adsEids.join(','), create_time: F.context('page').createTime || 0, asker_uid: F.context('page').uid || 0, viewer_uid: F.context('user').uid || 0 }; log.addKey({ evaSampling: 48, qid: F.context('page')['qid'] }); if (F.context('page').relateQids) { logOptions.relateQids = F.context('page').relateQids; } if (F.context('page').relateTopicQids) { logOptions.relateTopicQids = F.context('page').relateTopicQids; } if ($('.classinfo').length) { log.addKey({'classinfo': 1}); } var uadminIcon = $('.uadmin-a'); var uadminIconSize = uadminIcon.length; if (uadminIconSize) { logOptions.uadminIconNum = uadminIconSize; } log.addKey(logOptions); } var loc_ans = $.url.getQueryValue(location.href, 'loc_ans'); if(!loc_ans) { var myAnswerList = $('.wgt-best .answer-mine, .wgt-remend .answer-mine, .wgt-special .answer-mine'), myAnswer = null; if(myAnswerList.size()){ myAnswer = myAnswerList.first(); setTimeout(function(){ $(document).scrollTop(myAnswer.offset().top - 10); }, 200); } }else { var locAnswerList = $('.wgt-best .answer, .wgt-remend .answer, .wgt-special .answer'), locAnswer = null; locAnswerList.each(function(index, item) { if($(item).attr("id").indexOf(loc_ans) != -1) { locAnswer = $(item); } }); if(locAnswer) { setTimeout(function(){ $(document).scrollTop(locAnswer.parent().offset().top - 10); }, 200); } } var grid68 = $('.qb-content'), qid = F.context('page')['qid']; $.each({ 'qb-content' : '.q-content a@', 'qb-supply-content' : '.q-supply-content a@', 'qb-best-text' : '.wgt-best .best-text a@', 'qb-special-bast-text' : '.wgt-special .best-text a@', 'qb-remend-text' : '.wgt-remend .remend-text a@', 'qb-answer-text' : '.answer-text a@', 'qb-replyask-ask' : '.ask+dd a', 'qb-replyask-reply' : '.reply+dd a', 'qb-best-thank' : '.thank pre a', 'qb-answer-refer' : '.answer-refer a' }, function(key, val){ var aLink = grid68.find( val.replace(/\@$/, '[title!="点击查看大图"]') ) .not('.app-keyword,.inner-link') .filter(function(){ return this.getAttribute('href').match(/^http/i) && this.innerHTML != '' && !$(this).closest('.ed2k-wrap').size() && !$(this).closest('.thunder-wrap').size() }); aLink.click(function(){ log.send({ 'type' : 2014, 'page' : 'question', 'qid' : qid, 'area' : key, 'action': 'linkClick', 'text' : this.getAttribute('href'), 'host' : this.getAttribute('href').split('/')[2] }); }); grid68.find( val.replace(/\@$/, '') ).attr('rel', 'nofollow'); }); $(document).on('click', '.ikqb_img_alink', function(evt){ if($.browser.msie&&$.browser.version==6){ return false; } var imgTarget = $(this).find('img'), imgBigSrc = $(this).attr('href'), maxWidth = $(this).parent('p').outerWidth(), imgSmallSrc = imgTarget.attr('esrc'), sourceWidth = imgTarget.width(), sourceHeight = imgTarget.height(); if(imgTarget.hasClass('img_show')){ imgTarget.attr('src',imgBigSrc); if(!imgTarget.hasClass('ikqb_img')){ imgTarget.removeClass('ikqb_img'); imgTarget.animate({ 'width':'100%' },500); }else{ imgTarget.animate({ 'maxWidth':'500px', 'maxHeight':'340px' },500); } imgTarget.removeClass('img_show'); }else{ $(this).append(''); var bigImg = new Image(); bigImg.onload = function(){ imgTarget.attr('src',imgBigSrc); if(sourceWidth == bigImg.width){ imgTarget.removeClass('ikqb_img'); imgTarget.animate({ 'width':'120%' },500); }else{ imgTarget.animate({ 'maxWidth':bigImg.width>maxWidth?maxWidth:bigImg.width, 'maxHeight':bigImg.height },500); } imgTarget.addClass('img_show'); $('.ikqb_img_loading').remove(); } bigImg.src = imgBigSrc; } evt.preventDefault(); }); // 个人行家回答特型tooltip var mavinTips = []; var mavinTimeout = []; $('.mavin-reply-icon').each(function (index) { var me = this; var mavinLevelTitle = $(this).attr('data-title'); var mavinMajor = $(this).attr('data-major'); var content = '

[' + mavinLevelTitle + ']已完成实名认证+行业认证'; if (mavinMajor == 1) { content += '+专业认证'; } content += '

'; $(this).mouseenter(function (e) { $('div[role="tooltip"]').hide(); clearTimeout(mavinTimeout[index]); mavinTimeout[index] = setTimeout(function () { if (!mavinTips[index]) { mavinTips[index] = new Tip({ 'target': me, 'tooltipClass' : 'tip-white', 'autoDispose': false, 'direction': 'top', 'content': content, 'position': { my: 'left-20 top' } }); } mavinTips[index].show(); }, 70); }).mouseleave(function (e) { mavinTimeout[index] = setTimeout(function () { mavinTips[index] && mavinTips[ index ].hide(); }, 70); }); }); function jumpShare() { if ($('.jump-top-box').size() != 0) { // 调整返回顶部和任务列表的顺序 $('.jump-top-box').find('.jump-top').before($('.jump-top-box').find('.jump-task-list')); // 加入分享功能 var jumpShare = [ '', '分享', '', '' ].join(''); $('.jump-top-box').find('.jump-task-list').before(jumpShare); share.init({ target: $('.jump-share .share-area'), pageUrl: 'http://zhidao.baidu./question/' + F.context('page').qid, title: document.title, pos: 'rightSilde', logOpt: { module: 'question', page: 'qb', project: 'new-qb-share', postion: 'new-share-right' } }); // 如果有行家工作室，放在最顶部 if ($('.jump-top-box').find('.jump-goto-mavin').size()) { $('.jump-top-box').find('.jump-share').before($('.jump-top-box').find('.jump-goto-mavin')); } jumpTimer && clearInterval(jumpTimer); } } var jumpTimer = setInterval(function () { jumpShare(); }, 1000); }); }(); !function(){var F = (window.__IKNOW_GLOBAL__ || window).F;var require = (window.__IKNOW_GLOBAL__ || window).require; require.async(['mon:widget/js/util/tangram/tangram','mon:widget/js/util/log/log','mon:widget/js/util/event/event','mon:widget/js/ui/dialog/dialog','question:widget/js/file/file','question:widget/js/video/video','mon:widget/js/ui/tip/tip','question:widget/ask/share/share','mon:widget/js/util/https/https','question:widget/dom-ready/dom-ready'], function($, log, ec, Dialog, File, Video, Tip, share, https, domReady) { domReady.init(); }); }(); !function(){var F = (window.__IKNOW_GLOBAL__ || window).F;var require = (window.__IKNOW_GLOBAL__ || window).require; require.async(['mon:widget/js/logic/dom-ready/dom-ready'], function(D){ D.init([]) }); }(); require.async(['mon:widget/lib/jquery/jquery'], function ($) { if (!/chrome|firefox|safari|msie 10|rsv:11|msie [89]/i.test(navigator.userAgent)) { return; } window.BaiduHttps = window.BaiduHttps || {}; window.BaiduHttps.callbacks = function (data) { if (data && data.s === 0) { window.supportHttps = 1; setTimeout(function () { $('a[href^="http://www.baidu./s?"]').each(function (index, item) { var link = $(item).attr('href'); if (~link.indexOf('?wd=') || ~link.indexOf('&wd=')) { link = link.replace(/^http/, 'https'); $(item).attr('href', link); } }); }, 2000); } }; var script = document.createElement('script'); script.type = 'text/javascript'; script.src = 'https://www.baidu./con?from=zhidao'; document.body.appendChild(script); });

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在平面直角坐标系xoy中，动点M到定点F（0，14）的距离比它到x轴的距离大14，设动点M的轨迹是曲线E．（1）

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