（4x^2--8xy+3y-9)^2+5x+3的绝对值=0,求5（4x^2-8xy+3y-1）与x^2+8xy-3y+2的值

化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 （5x-4y-3xy）+（8x+y-2xy)合并同类项 x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2) x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值 已知2x+xy=10,3y+2xy=6.求4x+8xy+9y=? 3(x-y)²-7(x-y)+8(x-y)²+6(x-y)求详细过程（2） 5xy-4x²y-8xy²+3xy-xy²+4x²y 计算：5xy^2-[3xy^2-(4xy^2-2x^2y)]+2x^2y-xy^2 5xy^2-(3xy^2-(4xy^2-2x^2y))+2x^2y-xy^2求 5x^2y-3xy^2+4xy-14xy^2+4xy-2x^2y（化简） 已知xy/x+y=2,求代数式8x-5xy+8y/-x+3xy-y的值 计算：（1）8x^2y^2*(-3x/4y^5) (2)(x+y)^2/xy-y^2*(y-x)^2/xy+y^2 已知x-y=3xy,求5x+2xy-5y/x-4xy-y的值 因式分解30题(要过程)am+an+bm+bn x^2+5y-xy-5x x2+xy+2xz+x (a+b)x-(b+a)y -12x(x-y)-(y-x)x^2 2x^2+4x+2 x(x+z)-y(y+z) 2(x^2-3ab)+x(4a-3b) 4x^2+12xy+9y^2-25 x^4-16 16x^4-1 x^2+9x+8 x^2-10xy+24y^2 2x^2+15xy-8y^2 3x^2-6xy+3y^2 24x^2+22x-21 -x^2+4xy- 若（x+1)^2+|y-2|=0,求3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]的值 (-2xy+2x+5y)-(3xy+2y-2x)-(x+4y+xy)其中x-y=4xy=-1