因式分解3x2+xy-y2+x+9y-43X^2+XY-Y^2+X+9Y-4

分类: 作业答案 • 2022-02-12 11:12:57

问题描述：

因式分解3x2+xy-y2+x+9y-4
3X^2+XY-Y^2+X+9Y-4

答

题目有问题，数字修改了：
3x^2+5xy-2y^2+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)

答

原式=(3x-y)(x+2y)+x+9y-4 =(3x-y)(x+2y)-(3x-y)+4x+8y-4 =(3x-y)(x+2y-1)+4(x+2y-1) =(3x-y+4)(x+2y-1) 3x2+

答

题目有问题,数字修改了：
3x^2+5xy-2y^2+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)