(x²+y²+2xy)(x-y)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
分解因式 8(x²-2y²)-x(7x+y)+xy
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(x+2y-3xy)-(-2x-y+xy),其中x+y=,xy=-,求值.
已知x²-xy=4,y²-xy=9求下面代数式的值(1)x²-2xy+y²;(2
分式计算:(x²+2xy+y²)/(x²y+xy)*y/(x+y)
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y
化简:(x²+y²/x-y)-(2xy/x-y)
2x+2y/x-y与(x²+y²)/xy通分
(x-y)/(2x+2y)与(xy)/(x+y)²通分要过程
(x+y)(x²-xy+y²)—xy(x+y)因式分解