（2x-y)(3x-y)+(y-x)(2x-5y)
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（2x-y)(3x-y)+(y-x)(2x-5y)（2x-y)(3x-y)+(y-x)(2x-5y)（2x-y)(3x-y)+(y-x)(2x-5y)（2x-y)(3x-y)+(y-x)(2x-5y)
（2x-y)(3x-y)+(y-x)(2x-5y)
（2x-y)(3x-y)+(y-x)(2x-5y)
（2x-y)(3x-y)+(y-x)(2x-5y)
（2x-y)(3x-y)+(y-x)(2x-5y)
=（2x-y)(3x-y)-(x-y)(2x-5y)
=2x^2-5xy+y^2-(2x^2-7xy+5y^2)
=2x^2-5xy+y^2-2x^2+7xy-5y^2
=-5xy+y^2+7xy-5y^2
=2xy-4y^2
=2y(x-2y)
4x²-3y²
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