(-5xy)×3x^2y-12x^3×(-4分之7y^2)5分之2x²y×（-0.5xy）²-（-2x）³ ×xy³

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(-5xy)×3x^2y-12x^3×(-4分之7y^2)5分之2x²y×（-0.5xy）²-（-2x）³×xy³(-5xy)×3x^2y-12x^3×(-4分

(-5xy)×3x^2y-12x^3×(-4分之7y^2)5分之2x²y×（-0.5xy）²-（-2x）³ ×xy³
(-5xy)×3x^2y-12x^3×(-4分之7y^2)
5分之2x²y×（-0.5xy）²-（-2x）³ ×xy³

(-5xy)×3x^2y-12x^3×(-4分之7y^2)5分之2x²y×（-0.5xy）²-（-2x）³ ×xy³
原式=2/5 x2y×0.25x2y2-(-8x3)×xy3
=0.1 x2+2y1+2+8 x3+1y3
=8.1 x4y3

因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 化简(3x^2-5xy)+{-x^2-[-3xy+2(x^2-xy)+y^2]} x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2) -x^5y-xy+2x^3y 已知x+y分之xy=2,那么3x-5xy+3y分之3xy-x-y= 若xy/x+y=2,则3x-5xy+3y/-x+3xy-y=?/是分之 xy/x+y=2 求3x-5xy+3y/-x+3xy-y的值? 如果xy/x+y=2,那么3x-5xy+3y/-x+3xy-y=? 若xy=2（x+y),求（3x-5xy+3y)÷(-x+3xy-y) 的值已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y 已知Y-x=3xy,求(5x+3xy-5y)÷(x-2xy-y) 已知xy/x+y=3,求代数式2x-5xy+2y/x-3xy+y 已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值当x+y=5xy时,（3x+xy+3y)/x-2xy+y=?