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[2x-(x+y)(x-y)](yy-xx)
人气:131 ℃ 时间:2020-08-27 04:17:48
解答
[2x-(x+y)(x-y)](yy-xx)
=(2x-xx+yy)(yy-xx)
=2xyy-2xxx-xxyy+xxxx+yyyy-yyxx
=xxxx+yyyy-2xxyy+2xyy-2xxx
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