x(x+2y)-(x+2)^2+2x 其中x=2,y=-2分之1先化简，再求值。

因式分解x(x+y)(x-y)-x(x+y)^2 （x+3y)²-2（x-y)（x+y)+(x+y)²其x=0.5,y=-2 化简y(x+y)+(x+y)(x-y)-x^2 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 [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 x^2(x-y)+(y-x) x(x-y)2-(y-x)3 (x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2 【(x-y)^2+(x+y)(x-y)】除以 2x [(x-y)²+(x+y)(x-y)]除以2x 先化简 再求值 (2x-y)(y+x)-(x-2y)(2y+x)-(-3y+x)^2其(√x+1)+y^2+4=-4y 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 化简 3x(x^2-x-1)-(x+1)(3x^-x) X^3(x-y)+x(y-x) (x^2-y^2/x)[-x^2/(x-y)^2] y=x^2-2x（x