2(x+y)^2-2y(y+2x)=?
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2(x+y)^2-2y(y+2x)=?
2(x+y)^2-2y(y+2x)=?
2(x+y)^2-2y(y+2x)=?
2x^2
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
y+y'-2y=2x
微分方程y - 2y' + y = x
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)
填空:x-y/x+y=( )/x^2-y^2
(x-y)2•(y-x)³(x-y)=?
[(x-y)^2-(x+2y)(x-2y)]/y
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(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)
计算:y-x分之x+y+x-y分之y-y-x分之2x-y
因式分解x(x+y)(x-y)-x(x+y)^2
(x-4y)(2x+y)=
(x+y)(2x-3y)=?
x+y>=2,x-y
x+y>=2,x-y