1 -x^3y^3+2x^2y^2-xy2 4x^2-(x^2+1)^23 3x^2-3x+四分之三4 16x^4-y^45 8(a-b)^2-12(b-a)6 25(m-n)^2-9(m+n)^2这个是^次方的意思

1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-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) 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 计算3xy[2xy-x(y-2)+x-1] x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² X^Y-2XY^2+y^3 x²-y²+5x+3y+4（x+y-2xy)(x+y-z)+(xy-1）² (-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) x-y/x+y=-1/2,x*x-xy-2y*y/x*x-3xy+2y*y的解是多少?同上,请将过程写出, 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 [x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y [x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y [x(x^2y^2-xy)-y(x^2-x^3y)]/(2x^2y)