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问题
选择题
个体发育的起点是从
开始的。 [ ]
A.胎儿
B.受精卵
C.婴儿
D.卵细胞
答案
B
解答题
已知函数f(x)=x
3
+ax
2
+bx+c在x=-
2
3
与x=1时都取得极值
(1)求a、b的值与函数f(x)的单调区间.
(2)若对x∈[-1,2],不等式f(x)<c
2
恒成立,求c的取值范围.
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选择题
--- He hardly spent any time on his subjects, ____________ ?
--- _______________, so he does badly in his lessons.
A.didn’t he, Yes
B.did he, Yes
C.didn’t he, No
D.did he, No
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