.先化简,后计算.[2x(x²y-xy²)+xy(xy-x²)]/x²yx=20
.先化简,后计算.[2x(x²y-xy²)+xy(xy-x²)]/x²yx=20
计算:(xy-x²)×x-y/xy
3xy+xy+2x²y+yx²+3x²y等于多少
计算:(xy-x²)乘 x-y分之xy
计算:x²+2xy+y²/xy-y².x²-2xy+y²/xy+y
x²/xy-x/y
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
已知x-y=4xy,则2x+3xy-2yx-2xy-y
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
xy+yx=10x,y是多少
X²+2xy+y²/xy乘x²-2xy+y²/xy+y²=
(xy-x²)²÷(x-y)²/xy·x-y/x² 计算