化简(x^2-y^2)/(x+y)

化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 化简：（2x-y)²-4(x-y)(x+y) 1、x(x-y)(x+y)-x(x+y)^2 化简(y-x)(z-x)/(x-2y+z)(x+y-2z)+（z-y)(x-y)/(x-2z+y)(y+z-2x)+(x (2x+3y)(3x-2y)-(x-2y)(x+2y)化简 化简：[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x 化简：{(x+2y)(2y-x)-4y(-x+y) } / (-2x) 化简:【(2x-y)(2x+y)+y(y+6x)】÷2x 化简(x-3y)(3x+y)-(2x-3y)(2x-3y) 化简(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y) 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/【(x-y)/x】的负二次方 (1)(x^2/x)-y-x-y