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-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
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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
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x2-xy-2y2-x+5y-2
x2-xy-2y2-x+5y-2因式分解