Question

найдите модуль вектора 2c,если c=-i+2j+3k​

Answer 1

c = -i+2j+3k => c{-1; 2; 3}

2c{-2; 4; 6}

|2c| = ✓(2²+4²+6²) = ✓(4+36+16) = ✓56 = 2✓14