题目内容
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[主观题]
If it ____ for the flood, we ____ a good harvest.
A.had not been, would have had
B.was not, would have had
c.had not been, would have
D.were not, would have had
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，求f(f(x)),f(f(f(x))) ,
(x≠0),f(x+1)
=().
，证明：存在ξ∈(0，2)，使得f"(ξ)＜0。
