求解2(2x-3y)(x-y)-[(1/2x+3y)(1/2x-3y)-(1/2x-2y)^2]

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求解2(2x-3y)(x-y)-[(1/2x+3y)(1/2x-3y)-(1/2x-2y)^2]求解2(2x-3y)(x-y)-[(1/2x+3y)(1/2x-3y)-(1/2x-2y)^2]求解2(

求解2(2x-3y)(x-y)-[(1/2x+3y)(1/2x-3y)-(1/2x-2y)^2]
求解2(2x-3y)(x-y)-[(1/2x+3y)(1/2x-3y)-(1/2x-2y)^2]

求解2(2x-3y)(x-y)-[(1/2x+3y)(1/2x-3y)-(1/2x-2y)^2]
2(2x-3y)(x-y)-[(1/2x+3y)(1/2x-3y)-(1/2x-2y)^2] =(2x-3y)(2x-2y)-[(1/4x^2-9y^2)-(1/4x^2-2xy+4y^2)] =4x^2-4xy-6xy+6y^2-(1/4x^2-9y^2-1/4x^2+2xy-4y^2) =4x^2-10xy+6y^2-(2xy-13y^2) =4x^2-10xy+6y^2-2xy+13y^2 =4x^2-12xy+19y^2 你看答案是这个吧