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Автор - mixcer55533

Помогите найти скалярно произведение с помощтю 2 точек

Ответ

Автор - antonafanasev

Ответ:

17

Пошаговое объяснение:

CA = (1-(-1), -4-(-3)) = (2, -1)

DB = (3-(-2), 2-3) = (5, -1)

CA + DB = (2+5, -1-1) = (7, -2)

BC = (-1-3, -3-2) = (-4, -5)

AD = (-2-1, 3-(-4)) = (-3, 7)

BC - AD = (-4-(-3), -5-7) = (-1, -12)

(CA + DB)(BC - AD) = 7 * (-1) + (-2) * (-12) = -7 + 24 = 17

Ответы и объяснения

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