化简求值(xy-x²)/xy分之x²-2xy+y²乘x²分之x-y,其中y=二分
化简求值(xy-x²)/xy分之x²-2xy+y²乘x²分之x-y,其中y=二分
化简求值:(负三分之一 xy)²[xy(2x-y)-2x(xy-y²)],其中x=-一又二分之一,y
计算:(xy-x²)乘 x-y分之xy
化简求值:x-y/x²-2xy+y²-xy+y²/x²-y²,其中(x
小明在做化简求值题:(xy-x²)÷xy分之x²-2xy+y²乘x²分之x-y
化简求值3x²y-[2xy-2(xy-3/2x²y)+xy]+3xy²其中x=3、y=-1
化简求值.(x-2y分之4xy 再加+x)除以4x³-x²y分之x²+4xy+4y
先化简,再求值:2x²-2y²分之4x²-8xy+4y²乘xy(x-y)分之(x
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
先化简再求值x²-6xy+9y²分之x²-3xy 其中x=-1 y=3分之2
先化简再求值x-y分之x²+y²+y-x分之2xy,其中x=3+根号2,y=3-根号2
化简求值x²-2xy+y²分之(x-y)²,其中x=1,y=-2