1/2x^3y-2^2y^2+2xy^3因式分解

1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) X^Y-2XY^2+y^3 若1/x-1/y=2,求3x-2xy-3y/x-xy-y的值3x-2xy-3y/x-xy-y 不好意思，是3x-2xy-3y/x-2xy-y 因式分解x^2y^2+x^2y+xy^2+3xy+x+y+1 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) (-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 计算3xy[2xy-x(y-2)+x-1] (-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)] x^2-xy-6y^2+3xy+y+2 XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2) x²-y²+5x+3y+4（x+y-2xy)(x+y-z)+(xy-1）² （x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2 2x²y-3(2xy-xy)-xy 已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y) (x+y)(x-y)-(2xy+3y)平方平方是(2xy+3y)的 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________?