1、下列计算正确的是( )A、(x+y)2=x2+y2 B、(x﹣y)2=x2﹣2xy﹣y2 C、(x+2y)(x﹣2
1个回答
1.D
2.D
3.C
4.B
5.C
6.A
7.好像没有
8.C
9.D
10.C
11.D(答案不一定对)
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