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tema130300
@tema130300
July 2022
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10 задание помогите плиз .
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Используем определение и свойства векторного произведения
S= I m x n I =I (a-4b) x (3a+b) I =I(3a x a)-(4b x 3 a)+(a x b)-(4 b x b) I=
=I0+12a x b +a x b-0I=13 I a I·I b I ·sin(π/6)=13·1·2·1/2=13
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Verified answer
Используем определение и свойства векторного произведенияS= I m x n I =I (a-4b) x (3a+b) I =I(3a x a)-(4b x 3 a)+(a x b)-(4 b x b) I=
=I0+12a x b +a x b-0I=13 I a I·I b I ·sin(π/6)=13·1·2·1/2=13