Jawabanmu

2014-09-02T15:30:08+07:00
15i + 14b +13k - 30i -14 j + 51k= 14b-14j+ 64k - 15i
=14( b-j) +64k- 15i.
 sudah selesai ^_^
1 4 1
2014-09-02T15:31:14+07:00
(15i+14b+13k)+(-30i-14j+51k)
=15i+14b+13k-30i-14j+51k
=15i-30i+14b+13k+51k-14j
=-15i+14b+64k-14j
2 4 2