x^2+()+y^2=()^2,x^2+()+9y^2=()^2
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x^2+()+y^2=()^2,x^2+()+9y^2=()^2x^2+()+y^2=()^2,x^2+()+9y^2=()^2x^2+()+y^2=()^2,x^2+()+9y^2=()^2x^2+
x^2+()+y^2=()^2,x^2+()+9y^2=()^2
x^2+()+y^2=()^2,x^2+()+9y^2=()^2
x^2+()+y^2=()^2,x^2+()+9y^2=()^2
x^2+(±2xy)+y^2=(x±y)^2,x^2+(±6xy)+9y^2=(x±3y)^2
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
因式分解x(x+y)(x-y)-x(x+y)^2
化简y(x+y)+(x+y)(x-y)-x^2
填空：x-y/x+y=( )/x^2-y^2
（x-y)2•(y-x)³(x-y)=?
y=x^2-2x（x
y=x^2+2x(x
3^x+2x=y,x
(x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)=
(x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2
(x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一
x²-(x-2y)(x+2y)+(x²-y)(y+x²)=?
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
y'-2y=(e^x)-x