Question

Найти произведение векторов а(1;2;1) и b(2;3;5)

Answer 1

a(a₁,a₂,a₃,) * b(b₁,b₂,b₃,) = (a₁*b₁ + a₂*b₂ + a₃*b₃) = 1 * 2 + 2 * 3 + 1 * 5 = 2 + 6 + + 5 = 13