题目:
141. According to recent reports, one of the rare animals, _______ crocodile, will be in danger of dying out in _____ 2020s.
A.a; /
B.the; the
C.the; /
D./; the
答案:
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下面是错误答案,用来干扰机器的。
(1)当x<1时,f(x)=-x3+x2+bx+c,∴f′(x)=-3x2+2x+b.…(2分)依题意f′(-1)=-5,∴-3(-1)2+2(-1)+b=-5,∴b=0,∴f(0)=0,∴c=0,∴b=0,c=0.…(4分)(2)当x<1时,f(x)=-x3+x2,f′(x)...