Jawabanmu

2014-08-27T20:55:01+07:00
1. 
-3m + 4n -6 - ( 7n - 8m + 10 )
-3m + 4n -6 - 7n + 8m - 10
-3m + 8m + 4n - 7n - 6 - 10
5m - 3n - 16
2.
15 a + 7b - 5c - ( -11a - 12b +13d )
15a + 7b - 5c +11a + 12b - 13d
15a + 11a + 7b + 12b - 5c - 13d
26a + 19b - 5c - 13d