На
Надежда
2m = {-4;2;-2}
2m - n = {-4 - 1; 2 - 3; -2 -2} = {-5; -1; -4}
|2m - n| = sqrt( (-5)^2 + (-1)^2 + (-4)^2 ) = sqrt(25 + 1 + 16) = sqrt(42);
|2m| = sqrt( (-4)^2 + 2^2 + (-2)^2 ) = sqrt(16 + 4 + 4) = sqrt(24) = 2 * sqrt(6)
|n| = sqrt(1^2 + 3^2 + 2^2) = sqrt(1 + 9 + 4) = sqrt(15)
|2m| - |n| = 2 * sqrt(6) - sqrt(15)