怎样简便怎样计算
①÷×??? ②-÷0.3??③﹙-﹢﹚÷? ④37×⑤﹙4-÷﹚÷0.1? ⑥0.75×46+×55-3÷4.
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解;(1),
=×,
=;
(2)-÷0.3,
=-,
=;
?
(3)﹙-﹢﹚÷,
=60×60×60,
=44-48+21,
=65-48,
=17;
(4)37×,
=(36+1)×,
=36×+1×,
=35+,
=35;
(5)﹙4-÷﹚÷0.1,
=(4-2.5)÷0.1,
=1.5÷0.1,
=15;
(6)0.75×46+×55-3÷4,
=×(46+55-1),
=×100,
=75.
解析分析:(1)(2)(5)依据四则运算顺序计算方法解答,(3)(4)(6)依据乘法分配律解答.
点评:本题主要考查学生对于分数四则运算计算方法,以及乘法分配律知识的掌握,还要注意在计算中能约分的要约分.