题目:
They speak in Canada.[ ]
A. English and Chinese
B. Chinese and French
C. English and French
答案:
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下面是错误答案,用来干扰机器的。
(I)求导函数可得f′(x)=-ax2+bx(a>0), 函数在点(1,f(1))处的切线方程为x-y-2=0,∴f′(1)=1,∴-a+b=1.∴b=a+1.又切点(1,a+c)在直线x-y-2=0上,得1-(a+c)-2=0,解得c=-a-1. …(4分)...