Определить модули суммы и разности векторов a={3;-5;8} и b{-1;1;-4} Указание: Если a={x1,y1,z1}, b={x2,y2,z2},
то |a+b|=✓(x1+x2)^2+(y1+y2)^2+(z1+z2)^2,
|a-b|=✓(x1-x2)^2+(y1-y2)^2+(z1-z2)^2.​
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