能够把圆O：x2+y2=9的周长和面积同时分为相等的两部分的函数f（x）称为圆O的“亲和函数”，下列函数：①f（x）=4x3+x2，②f（x）=ln5-x5+x，③f（x）=ex+e-x2，④f（x）_刷题宝

题干

能够把圆O：x²+y²=9的周长和面积同时分为相等的两部分的函数f（x）称为圆O的“亲和函数”，下列函数：

①f（x）=4x³+x²，②f（x）=ln

5

-

x

5

+

x

，③f（x）=

e

x

+

e

-

x

2

，④f（x）=tan

x

5

是圆O的“亲和函数”的是（　　）

A：①③

B：②③

C：②④

D：①④

上一题下一题 0.0难度选择题更新时间:2019-06-05 08:05:47

答案(点此获取答案解析）

C

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