A=(3,2,0) b=(-1,4,2) Найти 1) a*b 2) a x b 3) |a| , |b| 4) (a+b)
1) a * b = (3·(-1) + 2·4 + 0·2) = -3 + 8 + 0 = 5 2) a x b = (2·2 - 0·4; 0·(-1) - 3·2; 3·4 - 2·(-1)) = (4; -6; 14) 3) 4) 5) a + b = (3-1; 2+4; 0+2) = (2; 6; 2)