4x^2y-[2xy-3(xy-x)+4x^2y] 先化简,再求值,其中x=1/3,y=3/4

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 （-3x^y+2xy)-( )=4x^+xy 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2) 3(x^2y+xy)-4(xy-2x^2y)-(-xy) 当x-y=2xy时,求4x-3xy-4y/xy XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2) 3（x平方y+xy)-4(xy-2x平方y)-(xy) (x^2+2xy+y^2-4xy)*(x^2-2xy+y^2+4xy) 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 一道数学题(3x^2y-4xy^2)/xy 5x^2y-3xy^2+4xy-14xy^2+4xy-2x^2y（化简） 计算：5xy^2-[3xy^2-(4xy^2-2x^2y)]+2x^2y-xy^2 5xy^2-(3xy^2-(4xy^2-2x^2y))+2x^2y-xy^2求 -3(xy-2x²)-[y²-(5xy-4x²)+2xy]