已知函数y=f（x）（x∈R）上任意一点P（x0，f（x0））处的切线的_爱下问搜题

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问题填空题

已知函数y=f（x）（x∈R）上任意一点P（x₀，f（x₀））处的切线的斜率k=（x₀-2）（x₀-5）²，则该函数的单调减区间为______．

答案

由题意可知函数的导函数为f′（x）=（x₀-2）（x₀-5）²，

函数的单调减区间，即函数的导函数小于0即可，

因此使（x₀-2）（x₀-5）²＜0，得x₀＜2，

故答案为：（-∞，2）．

补全对话，情景问答

补全对话。

A. That's very kind of you.
B. I forgot where I had put it.
C. You really should read it.
D. they are all out.
E. I'm afraid I haven't.
F. I haven't had it with me.
G. I have a copy of my own.

A:Have you ever read the novel "Jane Eyre"?
B:   1
A:What a pity（遗憾）!It's a wonderful book, you know.
B:Well, I've been wanting to read it for a long time, but I can't get one. The library has only three and   2
A:Well,  3     If you like, I'll lend it to you.
B:Thank you.   4    By the way, when can I get it?
A:    5   Will you please come to my house after school?
B:OK, I'll go as soon as school is over.

问答题论述题

试述影响共生固氮作用的环境因素。