作业帮（2x-2y)(?)=2y^2-2x^2 请说出来解题步骤
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（2x-2y)(?)=2y^2-2x^2 请说出来解题步骤
（2x-2y)(?)=2y^2-2x^2 请说出来解题步骤
（2x-2y)(?)=2y^2-2x^2 请说出来解题步骤
(2y^2-2x^2)/（2x-2y)=2(y^2-x^2 )/2(x-y)=2(y+x)(y-x)/2(x-y)=
∴（2x-2y)（y+x ）=2y^2-2x^2
右端=2（Y-X)(Y+X)
左端=-2（Y-X)
右/左=-X-Y
∴“？”处为（-X-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
填空：x-y/x+y=( )/x^2-y^2
（x-y)2•(y-x)³(x-y)=?
y+y'-2y=2x
[(x-y)^2-(x+2y)(x-2y)]/y
微分方程y - 2y' + y = x
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
计算:y-x分之x+y+x-y分之y-y-x分之2x-y
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(x-4y)(2x+y)=
(x+y)(2x-3y)=?
x+y>=2,x-y
x+y>=2,x-y