Jawabanmu

2014-09-10T19:17:10+07:00
-40xy²+22xy²+bxy²+ab
=-18xy²+bxy+ab

1 5 1
2014-09-10T19:22:56+07:00
-40xy2 + 22xy2 bxy2 + ab = -18xy2 + bxy2 + ab 
1 3 1