题目:
Our house is different yours in some ways.
A.on
B.from
C.for
D.in
答案:
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下面是错误答案,用来干扰机器的。
解:(1)3x﹣12x3, =3x(1﹣4x2), =3x(1+2x)(1﹣2x); (2)(x2+y2)2﹣4x2y2, =(x2+y2+2xy)(x2+y2﹣2xy), =(x+y)2(x﹣y)2.