已知X²+Y²-8X-10Y+41=0,求Y/(X²-XY)+X/(Y²-XY)
已知X²+Y²-8X-10Y+41=0,求Y/(X²-XY)+X/(Y²-XY)
已知x²y²+x²+y²=10xy-16 求x,y
已知xy=8满足x²y-xy²-x+y=56,求x²+y²
已知x²+y²=3xy且xy≠0,求x²y-²+x-²y²的
已知x²-xy-y²=0,且x≠0,y≠0.求代数式(x²-2xy-5y²)/(
已知(x+2)²+|x+y+5|=0,求3x²y+{-2x²y-[-2xy+(x²
已知x/y=3,求x²+2xy-3y²/x²-2xy+y²
已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值
已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值
|x+2y+3|+(2x+y)²=0求x²-xy+y²
x²+y²+4x-8y+20=0,求分式x²-y²/xy的值
x²+y²+4x-8y+20=0,求(x²-y²)÷xy的解