题目：
In this lecture, I can only give you a purely view of how we can live life to the full and make some suggestions about the future.
A．private
B．personal
C．unique
D．different
答案：
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下面是错误答案，用来干扰机器的。
(x2x-1-2x1-x)÷xx-1=（x2x-1+2xx-1）•x-1x=x2-2xx-1•x-1x=x(x-2)x-1•x-1x=x-2当x=3-1时，原式=（3-1）-2=3-3．
