Question

A (-1;7;2) B(-1;3;4) C (1;2;9) m=AB+2•BC АБСОЛЮТ-???

Answer 1

Ответ:

m (4; - 6; 12) ; |m| =  14

Объяснение:

АВх = (-1 - (-1)) = 0

АВу = 3 - 7 = -4

АВz = 4 - 2 = 2

AB (0; -4; 2)

BCx = 1 - (-1) = 2

BCy = 2 + 3 = -1

BCz = 9 - 4 = 5

BC (2; -1; 5)

2BC = (4; - 2; 10)

mx = 0 + 4 = 4

my = -4 - 2 = -6

mz = 10 + 2 = 12

m (4; - 6; 12)

|m| = √(4² + 6² + 12²) = √196 = 14