Jawabanmu

2014-04-18T17:12:12+07:00
A . 7i +4i -6j +12j-4j -3 = 11i +2j -3 b. 7i -6j +3 -12j = 7i -18j +3 c. 7i -6j -4i +4j = 3i -2j
2014-04-18T17:14:45+07:00
7i-6j+(-3+12j)+4i-4j = 7i-6j-3+12j+4i-4j = 11i + 2j - 3 7i-6j - (-3+12j) = 7i - 6j + 3 - 12j = 7i -18j + 3 7i - 6j - 4i + 4j = 3i - 2j
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