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@llllllllll11
August 2022
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Найти длину вектора 3а+2b, если а (-3,1,2) и b (4,1,-1)
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kirichekov
Verified answer
3a{3*(-3);3*1;3*2}, 3a{-9;3;6}
2b{2*4;2*1;2*(-1)}, 2b{8;2;-2}
3a+2b{-9+8;3+2;6+(-2)}, 3a+2b{-1;5;4}
|3a+2b|=√((-1)²+5²+4²) =√42
|3a+2b|=√42
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Answers & Comments
Verified answer
3a{3*(-3);3*1;3*2}, 3a{-9;3;6}2b{2*4;2*1;2*(-1)}, 2b{8;2;-2}
3a+2b{-9+8;3+2;6+(-2)}, 3a+2b{-1;5;4}
|3a+2b|=√((-1)²+5²+4²) =√42
|3a+2b|=√42