计算x/x+y·x²+2xy+y²/x²
计算:(xy-x²)×x-y/xy
(xy-x²)²÷(x-y)²/xy·x-y/x² 计算
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
x²/xy-x/y
计算[x/﹙xy+y﹚]·[﹙x²+x﹚/x²y]
计算:x²+2xy+y²/xy-y².x²-2xy+y²/xy+y
计算x²y³-2x(4xy³)
计算:(xy-x²)乘 x-y分之xy
计算:(x-y)(x²+xy+y²)
分式计算:(x²+2xy+y²)/(x²y+xy)*y/(x+y)
计算:1、(xy分之x²-y²)×(x-y分之x)-(y分之x);