已知函数f（x）=-x2,x≥0x2+2x,x<0，则f（f（﹣2））=_1不等式f（f（x））≤3的解集为_2_刷题宝

题干

已知函数f（x）=-x2,x≥0x2+2x,x<0，则f（f（﹣2））=____ 不等式f（f（x））≤3的解集为____

上一题下一题 0.0难度选择题更新时间:2018-12-07 09:10:47

答案(点此获取答案解析）

0,(-∞,3

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已知函数f（x）=|ax﹣1|﹣（a﹣1）x
当a=

\frac{1}{2}

时，满足不等式f（x）＞1的x的取值范围为____；若函数f（x）的图象与x轴没有交点，则实数a的取值范围为____．

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如图，矩形ABCD中，AB=2AD，E为边AB的中点，将△ADE沿直线DE翻转成△A₁DE（A₁∉平面ABCD），若M、O分别为线段A₁C、DE的中点，则在△ADE翻转过程中，下列说法错误的是（）

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需要帮忙吗？可以说：

同类题4

根据图片写出相应的单词

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阅读短文，判断正误。

Hello! I'm Linda. I have a good e-friend. Her name is Zhang Yun. Her English name is Betty. She is a Chinese girl, but she lives in the UK with her parents. Her father is a doctor and her mother is a teacher. She is ten years old. She call me big sister. She is good at English. She likes Chinese and I also like Chinese. She likes singing and playing basketball. This is my good e-friend. Do you want to know more?

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