Плиз решите номер 42.32 и номер 42.36.. Created by artpasevich. geometriya-ru

Плиз решите номер 42.32 и номер 42.36...

artpasevich @artpasevich

August 2022 1 1 Report

Плиз решите номер 42.32 и номер 42.36.

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oganesbagoyan

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43.32
----------------------------------------------------------------------------
a(4;-2;-4); b 6;-3;2) ;
(2a-3b)( a- 2b) -?
(2a-3b)( a- 2b) = 2a² -7ab + 6b² =
2(4² + (-2)² +4²) -7(4*6 +(-2)*(-3) +(-4)*2) +6(6² +(-3)² +2²) =2*36 -7*22+6*49=
=72-144+294 =222.
ответ: : 222 .
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43.36
a(-2;0) ⇒2a(-4;0) ;
b(1;-1)⇒kb(k ; -k) ;
2a - kb =(4-k ;k);
c (2 ;3) ;
вектора 2a - kb и c будут коллинеарны если
(4-k)/2 =k/3 ⇒k =2,4 .
ответ: 2,4.

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