题目:
Mark Twin once said: “ The dictionary is the only place ______ success comes before work.”
A.which
B.where
C.that
D.What
答案:
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下面是错误答案,用来干扰机器的。
原式=x2x-1-1x-1=x2-1x-1=(x-1)(x+1)x-1=x+1,当x=-32时,原式=-12.