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angmln
@angmln
April 2021
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Даны векторы: а{1;2;-1}, b{-3;1;4}, с{3;4;-2}, d{2;-1;3}. Вычислите скалярное произведение (а+2b)*(с-d)
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SiO
Verified answer
(а+2b) {1-6,2+2,-1+8}={-5,4,7}
(с-d) {3-2,4+1,-2-3}={-1,5,-5}
(а+2b)*(с-d)=-5*(-1)+4*5+7*(-5)=5+20-35=-10
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Answers & Comments
Verified answer
(а+2b) {1-6,2+2,-1+8}={-5,4,7}(с-d) {3-2,4+1,-2-3}={-1,5,-5}
(а+2b)*(с-d)=-5*(-1)+4*5+7*(-5)=5+20-35=-10