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AbraevAidar
@AbraevAidar
November 2021
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Срочно дам 100 баллов.
надо сделать номер #3, #4, #5.
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IrkaShevko
Verified answer
3.
(a + b)(a - b) = a*a - b*b = |a|² - |b|² = 9 + 4 - 4 - 16 - 1 = -8
4.
(c + 2d)*d = c*d + 2|d|² = |c|*|d|*cos30° + 2|d|² = 2*3*√3/2 + 18 = 3√3 + 18
5.
а = (6; 0; -8)
1) a * b = |a|*|b|*cos60° = 100*1*0,5 = 50
2) 6 * 4 + 0 * 1 - 8 * m = 0
8m = 24
m = 3
векторы перпендикулярны, если скалярное произведение равно 0.
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Answers & Comments
Verified answer
3.(a + b)(a - b) = a*a - b*b = |a|² - |b|² = 9 + 4 - 4 - 16 - 1 = -8
4.
(c + 2d)*d = c*d + 2|d|² = |c|*|d|*cos30° + 2|d|² = 2*3*√3/2 + 18 = 3√3 + 18
5.
а = (6; 0; -8)
1) a * b = |a|*|b|*cos60° = 100*1*0,5 = 50
2) 6 * 4 + 0 * 1 - 8 * m = 0
8m = 24
m = 3
векторы перпендикулярны, если скалярное произведение равно 0.