含字母的二次三项式的因式分解 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)

1、-kx^2+(2-k)x+2 =﹣[kx²+﹙k-2﹚x-2]=﹣﹙kx-2)(x+1)2、ax^2-(2a-1)x-2 =﹙ax+1﹚﹙x-2﹚3、ax^2+(2a-1)x =x﹙ax+2a-1)4、-2ax^2+(a-2)=﹣[2ax²-﹙a-2﹚]=﹣[√2a＋√﹙a-2﹚][√2a-√﹙a-2﹚]﹙a＞2﹚...抱歉，我打错了，第二个是ax^2-(2a+1)x+2,第四个是-2ax^2+(a-2)x+1ax^2-(2a+1)x+2 =﹙ax-1﹚﹙x-2﹚-2ax^2+(a-2)x+1＝﹣[2ax²-(a-2)x-1]=﹣﹙2x-1)(ax+1)