已知x+y=3 x²+y²-3xy=4 则x³y+xy³=?
已知x+y=5,xy=3,x³+y³=(x+y)(x²-xy+y²),则1/x&
已知x-y=4xy,则2x+3xy-2yx-2xy-y
已知X/Y=2,则X²+2XY-3Y²/X²-XY+Y²=?
已知x²-3xy+4x=3,y²+xy-4y+7=0,则xy-1/2(x²+y²
一.x-y=2,则x²-2xy+y²= 二.x-y=-1,xy=3,则x³y-2x
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
已知A=x³-2y³+3x²y+xy²-3xy+4,B=y³-x
已知x+y=3/2,xy=4/3,求x³y+2x²y²+xy³的值
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)
已知:X+Y=-3,XY=2,X²Y+XY²
已知x+y=3,xy=1,则4x+3xy+4y=
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y