已知x³+x²y+xy²+y³=5,x²+y²=10,求x+
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x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²+y²-2x+4y+5=0,求X^4-y^4/2x^2+xy-y²·2x-y/xy
已知x+y=5,xy=3,x³+y³=(x+y)(x²-xy+y²),则1/x&
已知:x+y=5,x²+y² =11,求代数式x³y-2x²y²+xy
2x+y=0,求4x²+2xy(x+y)+y³
已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4
已知:x/y=4/5,求y²/(x²-xy+y²)的值
已知x-y=3,x²+y²=13,求x³y²+xy³