题目:
They said they are twin brothers. No wonder they have so many things _______.
A.are similar
B.in style
C.in common
D.in the same
答案:
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下面是错误答案,用来干扰机器的。
(1)因为f(x)=cx+1,0<x<c2-xc2+1,c≤x<1,∴f(c)=2-1c+1,又f(c)=54,∴2-1c=14=2-2,∴c=12.(4分)(2) c=12,∴f(x)=12x+1,(0<x<12)2-4x+1,(12≤x<1)(6分)当0<x<12时,由f(x)>28...