已知x+y=2,xy=1/2,求x³y+2x²y²+xy³
已知x+y=2,xy=1/2,求x³y+2x²y²+xy³
已知xy=-1,求代数式-1/2x(xy²-y-x³y的四次方)
已知X²+Y²+X²Y²-4XY+1=0 求:(X-Y)^2008-(XY)^2
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知实数xy满足x²﹢y²-xy+2x-y+1=0求xy
已知实数x,y满足x²+y²-xy+2x-y+1=0 求x y
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
已知x+y=3 xy=-5 求x设abc=1 求x²+3xy+2y²/x²y+2xy
2x+y=0,求4x²+2xy(x+y)+y³
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知x-y=1/2,xy=8.求-1/2x³y-1/2xy³+x²y²的值.