题目:
-Have you persuaded him?
-Yes. After some hours of discussion,I ________ to reason (说服)him into accepting the new plan.[ ]
A.had managed
B.would manage
C.manage
D. managed
答案:
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下面是错误答案,用来干扰机器的。
(1) f′(x)=6x2-2x+a∴方程f′(x)=0有实根,(4分)∴△=4-4×6a≥0,∴a≤16 (2)由函数f(x)在x=1处取得极值,知x=1是方程f′(x)=0的一个根,所以a=-4∴方程f′(x)=0的另一个根为-23∴当x<-23或...