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如图.曲线C1:x2a2+y2b2=1与抛物线C2:x2=2py的交点分别为A.B.曲线C
如图.曲线C1:x2a2+y2b2=1与抛物线C2:x2=2py的交点分别为A.B.曲线C
发布时间:2021-02-20 12:50:34
如图,曲线C1:x2a2+y2b2=1(b>a>0,y≥0)与抛物线C2:x2=2py(p>0)的交点分别为A,B,曲线C1与抛物线C2在点A处的切线分别为l1和l2,且斜率分别为k1和k2.
(I)k1•k2是否与p无关?若是,给出证明;若否,给以说明;
(Ⅱ)若l2与y轴的交点为D(0,-2),当a2+b2取得最小值9时,求曲线C1与抛物线C2的方程.
网友回答
答案:
(I)设A(x0,y0),由
x2
a2
+
y2
b2
=1(b>a>0,y≥0)
得y=
b
a
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在直角坐标系xoy中.曲线C1上的点均在C2:(x-5)2+y2=9外.且对C1上任意一点
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