Jawabanmu

2014-08-25T18:26:42+07:00
4(c+d) + 3 (3c+2d)=
= 4c + 4d + 9c + 6d
= 13c + 10d
2014-08-25T18:26:54+07:00
(4c+4d)+(9c+6d)
(4c+9c)+ (4d +6d)
(13c + 10d)