Математика, 10-11 класс

→a = (-7, 4, -2)
→b = (8, 14, 0)

4→b = 4(8, 14, 0) = (32, 56, 0)
5→a = 5(-7, 4, -2) = (-35, 20, -10)
4→b - 5→a = (32, 56, 0) - (-35, 20, -10)

(32-(-35), 56-20, 0-(-10))
(32+35, 56-20, 0+10)

4→b - 5→a = (67, 36, 10)

Ответ: (67, 36, 10)