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DarkSide018
@DarkSide018
July 2022
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При каком значении m векторы
[tex](ma-b)[/tex]и mb перпендикулярны, если |a|=3, |i|=2, [tex]\ \textless \ (a,b)= \frac{ \pi }{3} [/tex]
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Answers & Comments
artalex74
Условие перпендикулярности: (ma - b)·mb = 0 =>
m²(ab)-m(bb)=0
ab = |a|·|b|·cos ∠(a,b) = 3*2*0,5=3
bb = |b|² = 2² =4
=> 3
m² - 4m = 0
m(3m - 4) = 0
m = 0 или m = 4/3.
Ответ: 0; 4/3.
3 votes
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Answers & Comments
m²(ab)-m(bb)=0
ab = |a|·|b|·cos ∠(a,b) = 3*2*0,5=3
bb = |b|² = 2² =4
=> 3m² - 4m = 0
m(3m - 4) = 0
m = 0 или m = 4/3.
Ответ: 0; 4/3.