Предмет: Геометрия, автор: gerryh81

Решить 1 УМОЛЯЮЮ!!!!!!!!

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Автор ответа: genius20

Скалярное произведение векторов равно произведению их модулей на косинус угла между ними:

$\overline{a} \cdot \overline{b}=|\overline{a}| \cdot |\overline{b}| \cdot \cos 150^{\circ}=4 \cdot 5 \cdot (- \cos 30^{\circ}})=-20 \cdot \dfrac{\sqrt{3}}{2}=-10\sqrt{3}.$

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