已知x²+y²-8x-10y+41=0,求x/y-y/x的值
已知x²+y²+8x+6y+25=0,求x-4y/x+y的值
已知x²-y²=8,x-y=4,求x,y的值
已知:x²+y²+4x+6y+13=0 求:x²+y²的值
1.已知x²-10x+y²+4y+29=0,求x²+y²值.
已知x²y²+x²+y²=10xy-16 求x,y
已知x²+4x+y²-10y+29=0 求【x+2y】÷【x²-2y²】的值
已知X²+Y²-8X-10Y+41=0,求Y/(X²-XY)+X/(Y²-XY)
已知x²+y²-4x+6y+13=0,求x²+2y/x²-3y²的值
x²+y²+4x-8y+20=0,求分式x²-y²/xy的值
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
已知(x²+y²)(x²+y²-6)+9=0 ,求x²+y²
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y的值