已知x+y=6,xy=-3,则x^2y+xy^2=把下列各式分解因式:（1）12xyz-9x^2y^2（2）6a^2-9ab+3a（3）-2x^2-12xy^2+8xy^3已知a+b=6，ab=7，求a^2b+ab^2

已知x+y=6,xy=-3,则x^2y+xy^2=? 已知x+y=6,xy=-3,则x∧y+xy∧2= 已知1/x=1/y=6,则3x-2xy+3y/3xy+x+y=?已知1/x+1/y=6,则3x-2xy+3y/3xy+x+y=? 已知2/X-1/Y=3,则(X-2Y-XY)/(5XY+6Y-3X)=? 已知2/x-1/y=3,则(2y-x+4xy)/(3x-6y-5xy)=? 已知1/X+1/Y=6,则3X-2XY+3y/3XY+X+Y=多少 已知xy=-2,x-y=3,求（x+y)（x-y)-y^2+（x-y)^2-（6x^2y-2xy^2)÷2y 已知x+xy+y=3,则(3x+2xy+3y)/(2x+xy+2y)= 已知x-y=3xy,则2x+3xy-2y除以x-2xy-y=? 已知x-y=3xy,则2x+3xy-2y/x-2xy-y= 已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y= 已知:x/y=-2,求x^2-2xy-3y^2/x^-6xy 已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值. 已知(xy)/(x+y)=6求(3x-2xy+3y)/(-x+3xy-y)的值. 已知xy/x+y=3,则代数式2x-7xy+2y/-x+xy-y的值是多少? 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值 已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y) 已知x^2-3xy+2y^2=0 则x/y+x/y=