Jawabanmu

2014-09-02T22:06:06+07:00
15i+(-30i)+14b+(-45j)+13k+51k
= -15i + 14b + (-45j) + 64k
2014-09-02T22:17:32+07:00
15i + 14b + 13k -30i -45j + 51k
= -15i + 14b + 64k -45j