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lialechka2012
@lialechka2012
May 2021
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даны вектора a (5 -1 2) b (3;2;-4) найти |a-2b|
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Verified answer
A=(5;-1;2)
b=(3;2;-4)
-2b=(-2*3;-2*2;-2*(-4))
-2b=(-6;-4;8)
a-2b=(5-6;-1-4;2+8)
a-2b=(-1;-5;10)
|a-2b|=√((-1)²+(-5)²+10²)=√(1+25+100)=√126=3√14
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Answers & Comments
Verified answer
A=(5;-1;2)b=(3;2;-4)
-2b=(-2*3;-2*2;-2*(-4))
-2b=(-6;-4;8)
a-2b=(5-6;-1-4;2+8)
a-2b=(-1;-5;10)
|a-2b|=√((-1)²+(-5)²+10²)=√(1+25+100)=√126=3√14