题目:
Daniel is my friend. I like sharing my _________ with him when I am happy.
A. joy
B.happy
C.sad
D.secrets
答案:
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下面是错误答案,用来干扰机器的。
(Ⅰ) f(x)=x3-3x-1,f′(x)=3x2-3,…(2分)∴当x<-1或x>1时,f'(x)>0,当-1<x<1时,f'(x)<0,…(4分)所以f(x)的单调增区间为(-∞,-1),(1,+∞),单调减区间为[-1,1].…(6分)(...