Помогите пожалуйста!!! . Created by vikarepeta23. matematika-ru

Ответ:6). 7). Пошаговое объяснение:✓6.a(-4;2)3×a=(-12; 6)✓7< ( a b)=45°|a|=5, |b|=10

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August 2022 1 8 Report

Помогите пожалуйста!!!

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kirichekov

Verified answer

Ответ:

6).

$|a| = 6 \sqrt{5}$

7).

$a \times b = 25 \sqrt{2}$

Пошаговое объяснение:

✓6.

a(-4;2)

3×a=(-12; 6)

$|a| = \sqrt{ {( - 12)}^{2} + {6}^{2} } \\ |a| = \sqrt{180} \\ |a | = 6 \sqrt{5}$

✓7

$cos(a \: b) = \frac{a \times b}{ |a| \times |b|}$

< ( a b)=45°

|a|=5, |b|=10

$cos {45}^{0} = \frac{a \times b}{5 \times 10} \\ \frac{ \sqrt{2} }{2} = \frac{a \times b}{50} \\ a \times b = 25 \sqrt{2}$

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