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xy[4xy-2(xy+1/2x的2次方y)]
人气:180 ℃ 时间:2020-08-17 07:10:58
解答
xy[4xy-2(xy+1/2x的2次方y)]
=xy[4xy-2xy-x的2次方y]
=xy[2xy-x²y]
=2x²y²-x³y²
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