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13a + 12a - 8b + 9b
2. 15i + 14b + 13k
-30i - 45j + 51k
_____________ +
- 15i + 14b - 45j + 64k
3.(3 - 17x + 35z) + (4x + 23y - 9)
= - 17x + 4x + 23y + 35z + 3 - 9 (kumpulkan variabel)
= - 13x + 23y + 35z -3
4.(42n + 35m + 7) - (50m - 20n + 9)
= 42n + 35m + 7 - 50m + 20n - 9
= 35m - 50m + 42n + 20n +7 - 9
= - 15m + 62n - 2
5.(5x + 3) - (x - 1)
= 5x + 3 - x + 1
= - 6x + 4
saya menjawab dengan serius
2. (15i + 14b + 13k) + (-30i - 45j + 51k ) = (15i - 30i) + (13k+51k) +14b - 45j = -15i + 64k + 14b - 45j
3. (3 - 17x + 35z) + (4x + 23 y - 9) = (3-9) + (-17x + 4x) + 23y + 35z = -6 - 13x +23y +35z
4. (42n + 35m + 7) - (50m - 20n + 9) = 62n - 15m - 2
5. (5x + 3) - (x - 1) = 4x +4