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Troimki
@Troimki
December 2021
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Решите пожалуйста срочно. 67 а и б. И 68. Даю 50 баллов.
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NNNLLL54
Verified answer
67a) a(-1,-5) , b(3,4)
a·b=-1·3-5·4=-3-20=-23
67b) a(1,0) , b(0,3)
a·b=1·0+0·3=0+0=0
68) ∠(a,b)=45° , |a|=5 , |b|=4
a·b=|a|·|b|·cos45°=5·4·√2/2=10√2
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Answers & Comments
Verified answer
67a) a(-1,-5) , b(3,4)a·b=-1·3-5·4=-3-20=-23
67b) a(1,0) , b(0,3)
a·b=1·0+0·3=0+0=0
68) ∠(a,b)=45° , |a|=5 , |b|=4
a·b=|a|·|b|·cos45°=5·4·√2/2=10√2