3x^2 8xy-3y^2

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3x^28xy-3y^23x^28xy-3y^23x^28xy-3y^2如果8xy前系数是加号3x^2+8xy-3y^2=（3x-y)(x+3y)如果8xy前系数是减号3x^2-8xy-3y^2=（3

3x^2 8xy-3y^2
3x^2 8xy-3y^2

3x^2 8xy-3y^2
如果8xy前系数是加号
3x^2 + 8xy-3y^2=（3x-y)(x+3y)
如果8xy前系数是减号
3x^2 - 8xy-3y^2=（3x+y)(x-3y)

3x y
x -3y
所以3x^2+8xy-3y^2=(3x+y)(x-3y)

化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 2x²y-3(2xy-xy)-xy 已知xy/x+y=2,求代数式8x-5xy+8y/-x+3xy-y的值 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) x^2-xy-6y^2+3xy+y+2 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) X^Y-2XY^2+y^3 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 计算：3xy[2xy-x（y-2）+x] 计算3xy[2xy-x(y-2)+x-1] （-3x^y+2xy)-( )=4x^+xy 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值 3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+2y²合并同类项 (8X^3Y-6X^2Y^2-2XY^3)/(3XY) (8X^3Y-6X^2Y^2-2XY^3)/(3XY) （12x^2y-8xy^2+16xy）/-3x+2y-4=? (12x^2y-8xy^2+16xy）/-3x+2y-4=?