已知x-y=3,x²+ y²=13,求x³y-8x²y²+xy
已知x-y=3,x²+ y²=13,求x³y-8x²y²+xy
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
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=3,x²+y²=13,求x³y²+xy³
已知x³=10-y³,x²y-xy²=-3,求代数式(x³-y
已知x-3y=0,求(x²-2xy+y²/x-y)-2y的值
已知X²+3XY-4Y²=0(Y≠0)求X-Y/X+Y
已知非零有理数x,y满足x²-4xy+4y²=0,求x-y/x+y-y-x/x+y的值.
已知:x-y=6 xy=3 求x³y²-x²y³
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