含字母的二次三项式的因式分解1、-kx^2+(2-k)x+22、ax^2-(2a-1)x+23、ax^2+(2a-1)x4、-2ax^2+(a-2)
1、-kx^2+(2-k)x+2
2、ax^2-(2a-1)x+2
3、ax^2+(2a-1)x
4、-2ax^2+(a-2)