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Ответ дан
vladbaranov201p67bwg
vec(a) * vec(b) = |a| * |b| * cosγ
-6.4 = 8 * |b| * (-0.1)
-0.8 * |b| = -6.4
|b| = 8.

Ответ

Ответ дан
SashaSimonova007

Нужно записать формулу скалярного произведения векторов а и b, а затем выразить из неё |b|

a × b = |a| × |b| × cos y => |b| = (a × b)/(|a| × cos y) = -6,4/(8 × (-0,1) = -6,4/(-0,8) = 8

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