x-y=1,xy=3,求x³y-2x²y²+xy³
已知x+y=2,xy=1/2,求x³y+2x²y²+xy³
2x+y=0,求4x²+2xy(x+y)+y³
若x=1/2,y=1 求x(x²+xy+y²)-y(x²+xy+y²)+3xy(
1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值
一.x-y=2,则x²-2xy+y²= 二.x-y=-1,xy=3,则x³y-2x
已知x+y=3 xy=-5 求x设abc=1 求x²+3xy+2y²/x²y+2xy
已知x+y=1,xy=3/16,求x³y-2x²y²+xy³的值
已知x-y=-1,xy=3,求x³y-2x²y²+xy³的值
已知x-y=1,xy=3,求x³y-2x²y²+xy³的值
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)