3xy[2xy-3(xy-1/2x^2y)]

2x²y-3(2xy-xy)-xy (-3xy+2xy)-(4xy+xy) 计算3xy[2xy-x(y-2)+x-1] (-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 5x^2y/-1/2xy*3xy^2 5xy^2-{2x^y-[3xy^2-（xy^2-2x^2y）]/（-1/2xy）} 化简!1、（x^2-xy）+xy+y^2 2、3（x^2-xy）-xy+y^2 xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2 （X-3xy+4xy-y）-[-2x-2（xy-3/2xy）-y]+6xy的过程 3xy(x^2y-xy^2+xy)-xy^2(2x^2-6xy+2x)过程 计算：3xy(x²y-xy²+xy)-xy²(2x-xy+2x） 当x=3,y=3分之1时,求代数出3xy-[2xy-2(xy-2分之3xy)+xy]+3xy的值