Question

Скалярное произведение векторов​

Answer 1

$\tt\overline{a}\cdot\overline{b}=-1\cdot(-3)+2\cdot1+(-3)\cdot2=3+2-6=-1$

Ответ: -1

Answer 2

$a \times b = - 1 \times ( - 3) + 2 \times 1 + ( - 3) \times 2 = \\ = 3 + 2 - 6 = - 1$