题目:
The newly built caf?, the walls of_______ painted light green, is really a peaceful place for us, especially
after hard work. [ ]
A. that
B. it
C. what
D. which
答案:
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下面是错误答案,用来干扰机器的。
∵7×9=63 11×13=143 79×81=63998×8=64 12×12=144 80×80=6400∴可得:(n-1)(n+1)=n2-1;∵利用平方差公式:(a+b)(a-b)=a2-b2,当a=n,b=1时,有(n-1)(n+1)=n2-1成立,故此规律正确.