x²+xy=12 xy+y²=13
x²+xy=12 xy+y²=13
已知x²y²+x²+y²=10xy-16 求x,y
xy²/(x²y-y) × x²/(x²+x)=
xy²/(x²y) - y×x²/(x²+x)=
已知X+Y=12,XY=9求(X²+3XY+2Y²)÷(X²2XY²)的值
已知13x²-6xy+y²-4x+1=0 求(xy-x²)五次方
若x² +xy+y² =14,x² -xy+y²=28求x+y的值
已知xy=8满足x²y-xy²-x+y=56,求x²+y²
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