(2/3xy)^-2÷（1/3x^-2)化成只含有正整数指数幂的形式

3xy(x^2-xy^2+xy)-xy^2(2x^2-xy+2x) 1-(3xy-x)+【-2(2x+3xy)】 计算3xy[2xy-x(y-2)+x-1] 3xy^2-(XY^2-2X^2Y)÷(1/2xy) （3x²y-xy²+1/2xy)÷（-1/2xy) （3x²y-xy²+1/2xy)÷（-1/2xy) ①(9x²y-6xy²)÷3xy ②(3x²y-xy²+2分之1xy)÷(-2分之1xy) 因式分解X^3-2xy+xy^2 2xy.(-3xy)÷(xy) 2x²y-3(2xy-xy)-xy (-3xy+2xy)-(4xy+xy) (-1/3xy)^2•[xy(2x-y)-2x(xy-y^2)] xy(xy+1)+xy+3-2(x+y+1/2)-(x+y-1)^2因式分解 (-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)] XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2) (-xy^-1)^2*(-xy^-2)^-3/(-x^2y^3) ( )-(x^2+3xy)=-xy-1/3y^2 y^3+xy^2+2xy+x^2-1 因式分解