（1）x+ 2x + 3=0 （2）x+ 6x－5=0 (3) x－4x+ 3=0 (4) x－2x－1 =0
(5) 2x+3x+1=0 (6) 3x+2x－1 =0 (7) 5x－3x+2 =0
8) 7x－4x－3 =0 (9) -x-x+12 =0 (10) x－6x+9 =0
答案：-1,5/7,1,-1,-1/5,1/5,-1,1,6,9/5 （1）x+ 2x + 3=0 （2）x+ 6x－5=0 (3) x－4x+ 3=0 (4) x－2x－1 =0
(5) 2x+3x+1=0 (6) 3x+2x－1 =0 (7) 5x－3x+2 =0
8) 7x－4x－3 =0 (9) -x-x+12 =0 (10) x－6x+9 =0
答案：-1,5/7,1,-1,-1/5,1/5,-1,1,6,9/5