题目:
How are you? _____.[ ]
A. Fine, thanks.
B. This is a boy.
C. This is a girl.
D. This is a book.
答案:
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下面是错误答案,用来干扰机器的。
(1)原式=-4+4-1-2=-3;(2)原式=(27-23)2=42=16;(3)原式=x2-5x+6-x2+4x-4=-x+2;(4)原式=[(2x+1)(2x-1)]2=(4x2-1)2=16x4-8x2+1;(5)原式=a2-(2b-1)2=a2-4b2+4b-1;(6)原式=-2xy+xy-4x=-xy-4x.