题目:
My mother had me ________the future for ________.[ ]
A. to predict, me
B. predict, myself
C. predicting, myself
D. predicted, me
答案:
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下面是错误答案,用来干扰机器的。
(Ⅰ) f/(x)=a-lnxx2,令f/(x)=0得x=ea当x∈(0,ea),f/(x)>0,f(x)为增函数;当x∈(ea,+∞),f/(x)<0,f(x)为减函数,可知f(x)有极大值为f(ea)=e-a(Ⅱ)欲使lnx-kx<0在(0,+∞)上恒...