下列各式中,运算结果为1-2xy2 x2y4的是(  ) A.(-1 xy2)2 B.(-1-xy2)2 C.(-1 x2y2)2 D.(-1-x2y2)2

1-2xy 2 x 2y 4=1-2xy 2 (xy 22=(1-xy 22
=(-1 xy 22
故选A.

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