作业帮(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
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(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)
=(x-y) (x-2y)+（x-3y)[(x+2y) -2(x-4y)]
=(x-y)(x-2y)+(x-3y)[10y-x]
=x^2-xy-2xy+2y^2+10xy-3y^2-x^2+3xy
=-y^2+10xy
=y(10x-y)
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
化简y(x+y)+(x+y)(x-y)-x^2
(x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
因式分解x(x+y)(x-y)-x(x+y)^2
[(x-y)^2-(x+2y)(x-2y)]/y
计算:y-x分之x+y+x-y分之y-y-x分之2x-y
x^2(x-y)+(y-x)
x(x-y)2-(y-x)3
【(x-y)^2+(x+y)(x-y)】除以 2x
[(x-y)²+(x+y)(x-y)]除以2x
[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
化简：[(x+y)(x-y)(x+y)^2-2y(x-2y)](-2y) 谢谢!
计算：[(x+y)(x-y)-(x-y)^2+2y(x-y)]/(-2y)
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y