Question

длина вектора (-2,-1,2) равна =?

Answer 1

|a|=√(x1²+x2²+x3²)=
√(4+1+4)=√9=3

Answer 2

$|a| = \sqrt{ x^{2} + y^{2} + z^{2} } = \sqrt{4 + 1 + 4} = \sqrt{9} = 3$