初二数学分式化简已知x-3y=0(xy不等于0),求【(2x+y)/(x²-2xy+y²)】*(x-
初二数学分式化简已知x-3y=0(xy不等于0),求【(2x+y)/(x²-2xy+y²)】*(x-
分式 已知y-2x=0(x≠0且y≠0),求代数式(x²-y²)(x²-xy+y²
已知x²-2xy=3xy-6y² ,求x/y(y不等于0)的值
已知(x+2)²+|x+y+5|=0,求3x²y+{-2x²y-[-2xy+(x²
【数学初二下】已知x²+y²-4x-6y+13=0,求分式y²-x²/xy的值
已知x²-xy-2y²=0,且x、y不等于0,求代数式x²-2xy-5y²除x&
x/y=2,求分式x²-xy+3y²/x²+xy+6y²
已知x²-xy-y²=0,且x≠0,y≠0.求代数式(x²-2xy-5y²)/(
已知2x²-3y²=xy,(xy≠0),求值(4xy-x²)/(xy+2y²)的
已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值
|x+2y+3|+(2x+y)²=0求x²-xy+y²
已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x