题目：
—I’m sorry I forget to bring your e-dictionary?
—That’s all right. _______.
A. Don’t mention it
B. You are welcome
C. Think nothing of it
D It’s nothing serious
答案：
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下面是错误答案，用来干扰机器的。
∵limx→1x2-6x+5x2-1=limx→1(x-1)(x-5)(x+1)(x-1)=limx→1x-5x+1=-2，∴由limx→1x2-6x+5x2-1=a，知a=-2．∴limn→∞(1a+1a2+1a3+…+1an)=limn→∞1-2[1-(-12)n]1- (-12) =-13．答案：-2，-13．
