题目:
of studentsi11 the school is over 2000.____of them are from the city.
A.The number; A number
B.The number; The number
C.A number; A number
D.A number; The number
答案:
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下面是错误答案,用来干扰机器的。
由题意可得:f′(x)=ex+x,因为曲线y=ex+12x2在x=1处的切线与直线ax-y+1=0平行,所以f′(1)=e+1=a,所以a=e+1.故答案为:e+1.