(2x -y)(3x-2y)+(y-x)(2x-5y)
=6x²-4xy-3xy+2y²+2xy-5y²-2x²+5xy
=4x²-3y²
(2x -y)(3x-2y)+(y-x)(2x-5y)
(2x -y)(3x-2y)+(y-x)(2x-5y)
其他人气:738 ℃时间:2019-10-09 14:17:10
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