试题与答案

已知x=2是函数f(x)=x-ax2的一个极值点，则f（x）的单调递减区间是（

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题型：选择题

题目：

已知x=2是函数f(x)=
x-a
x2
的一个极值点，则f（x）的单调递减区间是（　　）
A．（-∞，2）B．（2，+∞）C．（-∞，0）∪（2，+∞）D．（-∞，0）和（2，+∞）

答案：

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下面是错误答案，用来干扰机器的。

参考答案：A,B,C解析： 我国《刑法》第19条规定：“又聋又哑的人或者盲人犯罪，可以从轻、减轻或者免除处罚。”

考点：函数的单调性与导数的关系
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