1/2+1/2x^2+1/2xy+1/2x^2y-1/3x^2-1/3xy-1/3x^2y计算1.(2/3)^8*8^9*(3/4)^10/(4)^9计算1/2+1/2x^2+1/2xy+1/2x^2y-1/3x^2-1/3xy-1/3x^2y

.(x+y-2)(x+y-2xy)+(xy-1)^2 计算3xy[2xy-x(y-2)+x-1] 1-(3xy-x)+【-2(2x+3xy)】 xy(xy+1)+xy+3-2(x+y+1/2)-(x+y-1)^2因式分解 (-1/3xy)^2•[xy(2x-y)-2x(xy-y^2)] (-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)] 已知x+y=1,xy=-2,则x²y+xy²-2xy 因式分解（x+y)(x+y+2xy)+(xy+1)(xy-1) 分解因式(x+y)(x+y+2xy)+(xy+1)(xy-1) 分解因式：(X+Y）*（X+Y+2XY）+（XY+1）*（XY-1） 因式分解：1/2x-xy+1/2xy² y^3+xy^2+2xy+x^2-1 因式分解 5x^2y/-1/2xy*3xy^2 (-xy^-1)^2*(-xy^-2)^-3/(-x^2y^3) 1-2/x+y=xy,4y+6x=xy.求xy的解? XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2) 因式分解xy²-2xy+x+2y-1 ( )-(x^2+3xy)=-xy-1/3y^2