Предмет: Геометрия, автор: moskalecnasta978

Відомо, що а (2; 5; - 4) і b (-1; 2; - 3). Знайдіть модуль вектора - 2а + 3b.​

RostGai: А там -2а+3b чи це просто тире?
moskalecnasta978: Минус)

Ответы

Автор ответа: liftec74
1

Ответ:   sqr (66)

Объяснение:

найди   координаты вектора -2а

=(-4; -10 ; 8)   и координаты вектора 3b =(-3; 6; -9)

найди координаты суммарного вектора (-7; -4; -1)

Теперь найди длину ( модуль) полученного вектора =

sqr( 49+16+1)=sqr(66)

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