已知函数f（x）=|cosx|sinx，给出下列五个说法： ①f（ 823 π）=﹣ 34 ；②若|f（x1）|=|f（x2）|，则x1=x2+kπ（k∈Z）；③f（x）在区间[﹣ π_刷题宝

题干

已知函数f（x）=|cosx|sinx，给出下列五个说法：

①f（

82

3

π）=﹣

3

4

；

②若|f（x₁）|=|f（x₂）|，则x₁=x₂+kπ（k∈Z）；

③f（x）在区间[﹣

π

4

， π

4

]上单调递增；

④函数f（x）的周期为π．

⑤f（x）的图象关于点（

π

2

，0）成中心对称．

其中正确说法的序号是____．

上一题下一题 0.0难度选择题更新时间:2019-10-17 11:06:28

答案(点此获取答案解析）

①③

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实验室用下列仪器和药品制取并收集干燥纯净的氯气．

同类题2

读对话，将人物与其喜欢的图片匹配

Lingling: I like cake. Do you like cake, Daming?

Daming: No, I don't. But I like rice.

Lingling: Does your brother Dayong like rice, too?

Daming: No, he doesn't. He likes noodles.

Lingling: Does Amy like apples?

Daming: Yes, she does. But her sister Mary likes pears.

同类题3

在括号里填上合适的素数．(从小到大填写)

30＝____×____×____

同类题4

已知函数f（x）=ax²+

\frac{b}{x}

+5（常数a，b∈R）满足f（1）+f（﹣1）=14．

同类题5

阅读短文，根据短文内容，选择正确答案。

Bob: Hello, Candy! What are you going to do on Sunday?

Candy: Oh, I'm going to the park to have a picnic.

Bob: Do you like having a picnic?

Candy: Yes, I do. What about you?

Bob: Me, too. But my favourite hobby is playing computer games.

I think it's very fun.

Candy: D o you want to go with us?

Bob: Sure. What time?

Candy: At 8:00 o'clock tomorrow.

Bob: OK. See you later.

Candy: See you.

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