Jawabanmu

2014-09-08T17:01:30+07:00
15i-30i+13k+51k+14b-45j= -15i+64k+14b-45j
2014-09-08T17:03:58+07:00
15i-30i+14b-45j+13k+51k =-15i+14b-45j+64k