作业帮(2x -y)(3x-2y)+(y-x)(2x-5y)
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/16 23:30:16
(2x -y)(3x-2y)+(y-x)(2x-5y)
(2x -y)(3x-2y)+(y-x)(2x-5y)
(2x -y)(3x-2y)+(y-x)(2x-5y)
(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)
=6x²-7xy+2y²+7xy-2x²-5y²
=4x²-3y²
=(6x^2-4xy-3xy+2y^2)+(2xy-5y^2-2x^2+5xy)
=4x^2-3y^2
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