Jawabanmu

2014-09-11T16:56:21+07:00
(15b + 14b + 13k) + (-30i - 45j - 51k)= 15b+14b+13k-30i-45j-51k= 15b+14b-30i-45j+13k-51k= 29b-30i-45j-38k