计算xy-y²分之x²+2xy+y²÷x²-2xy+y²分之xy+y&
计算xy-y²分之x²+2xy+y²÷x²-2xy+y²分之xy+y&
计算:(xy-x²)乘 x-y分之xy
计算:2x+2y分之3y + x²+xy分之2xy
计算:(xy-x²)×x-y/xy
计算:x²+2xy+y²/xy-y².x²-2xy+y²/xy+y
x²+y²+2xy分之x²-4y² ÷x²+xy分之2y+x
(x²+2xy+y²分之x²-4y²)÷(x²+xy分之x+2y)
(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y
(xy分之x²-y²)-(xy-x²分之xy-y²)
2x+2y分之3y 加 x²+xy分之2xy
计算:1、(xy分之x²-y²)×(x-y分之x)-(y分之x);
计算2分之1xy²(-2xy)+3x²y的3次方=