Jawabanmu

2014-02-28T13:27:01+07:00
a=2i-j+k, b= 3i+2j-k, c= 4i-3j+k dan u= a+2b-c
u=12i+6j-2k
1 5 1
2014-02-28T18:14:52+07:00
2b=2(3i+2j-k) =6i+4j-2k u=a+2b-c =2i-j+k+6i+4j-2k-(4i-3j+k) =2i-j+k+6i+4j-2k-4i+3j-k =2i+6i-4i-j+4j+3j+k-2k-k =4i+6j-2k