填空：x-y/x+y=( )/x^2-y^2
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填空：x-y/x+y=()/x^2-y^2填空：x-y/x+y=()/x^2-y^2填空：x-y/x+y=()/x^2-y^2分子分母同时乘以x-y即(x-y)^2/(x+y)(x-y)=(x-y)^
填空：x-y/x+y=( )/x^2-y^2
填空：x-y/x+y=( )/x^2-y^2
填空：x-y/x+y=( )/x^2-y^2
分子分母同时乘以x-y
即(x-y)^2/(x+y)(x-y)
=(x-y)^2/x^2-y^2
空格中填（x-y）^2
(x-y)/(x+y)
=[(x-y)(x-y)]/[(x+y)(x-y)]
=(x-y)²/(x²-y²)
所以：(x-y)/(x+y)=(x-y)²/(x²-y²)
x-y/x+y=(x^3-xy+x^2y+x^2y^2 )/x^2-y^2
填空：x-y/x+y=( )/x^2-y^2
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
(x-y)( )+y^2-x^2填空
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
填空(x+y)^2+( )=(x-y)^2
(x-y-z)*( )=x^2-(y+z)^2 填空
填空 (x^2-y^2)(x+y)^2=(x-y)(____)^3
填空x+y-z=x+( )=x-( )填空x+y-z=x+()=x-()
填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( )填空-5/7x=( )/7x=5/( ) x-y/x+y=X^2-y^2/( )
化简 x / y(x+y) - y / x(x+y) =
化简y(x+y)+(x+y)(x-y)-x^2
填空.(X-Y)的平方+( )=(x+y)的平方
（x-y)2•(y-x)³(x-y)=?
y+y'-2y=2x
微分方程y - 2y' + y = x
(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)