以知xy=8满足x²y-xy²-x+y=56求x²+y²过程
已知xy=8满足x²y-xy²-x+y=56,求x²+y²
.已知xy=8满足x²y-xy²-x+y=56,求x²+y²的值 2.若x-3=
已知x²y²+x²+y²=10xy-16 求x,y
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
|x+2y+3|+(2x+y)²=0求x²-xy+y²
若x² +xy+y² =14,x² -xy+y²=28求x+y的值
若x²+xy+y²=14,x²-xy+y²=28,求x+y的值
x/y=2,求分式x²-xy+3y²/x²+xy+6y²
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
xy²/(x²y-y) × x²/(x²+x)=