X²+2xy+y²/xy乘x²-2xy+y²/xy+y²=
X²+2xy+y²/xy乘x²-2xy+y²/xy+y²=
计算:(xy-x²)×x-y/xy
计算:(xy-x²)乘 x-y分之xy
计算:x²+2xy+y²/xy-y².x²-2xy+y²/xy+y
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
xy²=2,求代数式xy²乘(-x²y²)乘(1/2xy³)²
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
化简求值(xy-x²)/xy分之x²-2xy+y²乘x²分之x-y,其中y=二分
x²/xy-x/y
因式分解xy²-2xy+x+2y-1
3xy²-[xy-2(xy-3/2x²y)+3xy²]+3xy²,其中x=3,y
[-xy/(x-y)²]²×(y²-xy/x)³