Question

Tolong nomer 14 dengan caranya, makasih:)

Answer 1

AB = b-a = { (3-1), (3-2),(1-3)} = (2, 1, -2)
BC = c-b  ={(7-3), (5-2), (-3-1)}= (4, 2, -4)

BC = 2 AB 
AB : BC = 1 : 2

Answer 2

AB = B-A = (2,1,-2)
BC = C-B = (4,2,-4 )
Maka AB : BC = 1 : 2