Question

Даны вектора а(4,2,1) и в(-2,2,3). Найдите:

|а|-|в| и |а+в|

Answer 1

$</p><p>|a|=\sqrt{4^2+2^2+1^2}=\sqrt{21}\\</p><p>|b|=\sqrt{(-4)^2+4^2+3^2}=\sqrt{41}\\</p><p></p><p>a+b=(4-2;2+2;1+3)=(2;4;4)\\</p><p>|a+b|=6</p><p>$