计算(-3分之1xy²)²×[xy(2x-y)+xy²]=
计算:(xy-x²)乘 x-y分之xy
计算2分之1xy²(-2xy)+3x²y的3次方=
(1)-2分之1xy(3y²-2xy+3x²y)
计算:2x+2y分之3y + x²+xy分之2xy
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
3xy+3y²分之x²+xy=3y分之( )
计算:(-7x²y)(2x²y-3xy³+xy)
计算:(xy-x²)×x-y/xy
(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
(3x²y-xy²)-3(x²y-2xy²) x=2分之1 y=3分之1
计算xy-y²分之x²+2xy+y²÷x²-2xy+y²分之xy+y&