计算 ：(2x-5y+3)(2x+5y-3) (x-2y)(x-3y)-(3x-2y)^2（2x-5y+3)(2x+5y-3)(x-2y)(x-3y)-(3x-2y)^2

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计算 ：(2x-5y+3)(2x+5y-3) (x-2y)(x-3y)-(3x-2y)^2（2x-5y+3)(2x+5y-3)(x-2y)(x-3y)-(3x-2y)^2
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计算 ：(2x-5y+3)(2x+5y-3) (x-2y)(x-3y)-(3x-2y)^2（2x-5y+3)(2x+5y-3)(x-2y)(x-3y)-(3x-2y)^2
计算 ：(2x-5y+3)(2x+5y-3) (x-2y)(x-3y)-(3x-2y)^2
（2x-5y+3)(2x+5y-3)
(x-2y)(x-3y)-(3x-2y)^2

计算 ：(2x-5y+3)(2x+5y-3) (x-2y)(x-3y)-(3x-2y)^2（2x-5y+3)(2x+5y-3)(x-2y)(x-3y)-(3x-2y)^2
1.(2x-5y+3)(2x+5y-3) 2.(x-2y)(x-3y)-(3x-2y)^2
=[2x-(5y-3)][(2x+(5y-3)] =x^2-5xy+6y^2-(9x^2-12xy+4y^2)
= = -8x^2+7xy+2y^2
=4x^2-25y^2+30y-9 =2y^2+7xy-8x^2

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