数学题目解答 [(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
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=(x-y)[(3x+y)-(2x+3y)]*(x-y)
=(x-y)*(x-y)(3x+y-2x-3y)
=(x-y)(x-y)(x-2y)
到底是化简，还是？
=(x*x-2xy+y*y)(x-2y)
=x^3-4x*x*y+5xy*y-2y^3
=(x-y)*(x-y)(3x+y-2x-3y)
=(x-y)(x-y)(x-2y)
到底是化简，还是？
=(x*x-2xy+y*y)(x-2y)
=x^3-4x*x*y+5xy*y-2y^3
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