已知x-y=3,x²+y²=13,求x³y²+xy³
已知x-y=3,x²+y²=13,求x³y²+xy³
已知x-y=3,x²+ y²=13,求x³y-8x²y²+xy
已知x+y=2,xy=1/2,求x³y+2x²y²+xy³
已知x³=10-y³,x²y-xy²=-3,求代数式(x³-y
已知:x-y=6 xy=3 求x³y²-x²y³
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x+y=5,xy=3,x³+y³=(x+y)(x²-xy+y²),则1/x&
已知x/y=3,求x²+2xy-3y²/x²-xy+y²
已知y分之x=3,求x²-xy+y²分之x²+2xy-3y²
已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值