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)