化简 3x2+5xy-2y2+x+9y-4

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化简3x2+5xy-2y2+x+9y-4化简3x2+5xy-2y2+x+9y-4化简3x2+5xy-2y2+x+9y-43x2+5xy-2y2+x+9y-4=(x+2y)(3x-y)+x+9y-4设a

化简 3x2+5xy-2y2+x+9y-4
化简 3x2+5xy-2y2+x+9y-4

化简 3x2+5xy-2y2+x+9y-4
3x2+5xy-2y2+x+9y-4
=(x+2y)(3x-y)+x+9y-4
设a(x+2y)+b(3x-y)=x+9y,得
a=4,b=-1
3x2+5xy-2y2+x+9y-4
=(x+2y)(3x-y)+x+9y-4
=(x+2y)(3x-y)+4(x+2y)-(3x-y)-4
=(x+2y-1)(3x-y+4)

计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2）因式分解：3x2+5xy-2y2+x+9y-4 x2+x-(a2-a) 3x2+4xy-y2 x,y,a后面的2表示平方化简 3x2+5xy-2y2+x+9y-4 因式分解 2x2+xy-y2-4x+5y-6 x2-y2+a2-b2+2ax+2by 3x2+5xy-2y2+x+9y-4 b4-2b2-82x2+xy-y2-4x+5y-6x2-y2+a2-b2+2ax+2by3x2+5xy-2y2+x+9y-4b4-2b2-8 因式分解2x2-7xy-22y2-5x+35y-3 x2-3xy-10y2+x+9y-2 解方程组｛3x2-y2=8 {4x2+12xy+9y2=1 {x2+2xy+y2-4=0 x2+xy+y2=4 4x2-9y2=0 x2-2xy+y2-1=0还有{x2+y2=4xy-y2+4=0x2-----x的平方 y2------y的平方还有{2x-3y=12x2-3xy+y2-4x+3y-3=0 已知x/y=3/5,求 (x2-xy+2y2)/(x2+2xy-y2)的值 -(x2+y2)+[-3xy-(x2-y2)]化简X=-1,y=2X2表示X的2次方 3XY表示XY乘3 因式分解：3X2十5xy－2y2＋x＋9y－4 x2-4y2-3xy+y+x 分解因式（1）32+5xy-2y2+x+9y-4 （2）2x2+xy-y2-4x+5y-6 (3)3x2+4xy-y2 X3+9+3X2+3X分解因式 2X2+XY-Y2-4X+5Y-6分解因式 (3xy-9x2-2y2-6xy)-(6x2+2xy-3xy-y) x2+2xy-3y2+3x+y+2 因式分解因式分解x2+2+y2-3x-2xy+3y 因式分解2y2-xy-3x2-2y+3x x2-xy-2y2-x+5y-2 x2-xy-2y2-x+5y-2因式分解