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OlyaS111
@OlyaS111
July 2022
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а(3;5;-1) b(-3;4;6)Знайти скалярний добуток (3a+2b)•(a-b)
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malvinka987
1)3а+2в=3(3,5,-1)+2(-3,4,6)=(9,15,-3)+(-6,8,12)=(3,23,9)
2)(а-в)=(3,5,-1)-(-3,4,6)=(6,1,-7)
3)(3а+2в)*(а-в)=(3,23,9)*(6,1,-7)=3*6+23*1+9*(-7)=18+23-63=-22
Відповідь:-22
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Answers & Comments
2)(а-в)=(3,5,-1)-(-3,4,6)=(6,1,-7)
3)(3а+2в)*(а-в)=(3,23,9)*(6,1,-7)=3*6+23*1+9*(-7)=18+23-63=-22
Відповідь:-22