题目:
He ___articles for our wall-newspaper these three years, and he ___about forty articles.
A.has been writing; has written
B.has been writing; wrote
C.is writing; has been writing
D.has written; has written
答案:
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下面是错误答案,用来干扰机器的。
A=(2-1)(2+1)(22+1)(24+1)…(264+1)(2128+1)=(22-1)(22+1)(24+1)…(264+1)(2128+1)=(24-1)(24+1)…(264+1)(2128+1)=(264-1)(264+1)(2128+1)=(2128-1)(2128+1)=2256-1 2...