(x+2y-3)(x-2y+3)-(x-2y-3)^2乘法公式计算
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(x+2y-3)(x-2y+3)-(x-2y-3)^2乘法公式计算(x+2y-3)(x-2y+3)-(x-2y-3)^2乘法公式计算(x+2y-3)(x-2y+3)-(x-2y-3)^2乘法公式计算=
(x+2y-3)(x-2y+3)-(x-2y-3)^2乘法公式计算
(x+2y-3)(x-2y+3)-(x-2y-3)^2乘法公式计算
(x+2y-3)(x-2y+3)-(x-2y-3)^2乘法公式计算
=[x^2-(2y-3)^2]-[x^2-2x(2y-3)+(2y-3)^2]=2x(2y-3)-2(2y-3)^2=2(2y-3)(x-2y+3)
x(x-y)2-(y-x)3
[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x
化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x
计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x
化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
计算：x+2y/x-y+2x/y-x-3y/x-y
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
2X(2X-3Y)-3Y(X+Y)
(-2x y)^2-(3y-x)(-x-3y)
（x+2y)^2-(x+y)(3x-y)
计算(x+y)(x+y)^2(-x-y)^3
化简:5(x-y)+2(x+y)-3(x-y)
3x(x-y)+2y(x-y) 计算
化简3(x-y)-7(x--y)+2(y-x)
因式分解:3x(x-y)+2y(y-x)
(x-y)^3×（x-y)^2×(y-x)
分解因式：3x(y-x)-2y(x-y)