Ответ:
1. a⁻ * b⁻ = |a⁻| * |b⁻| * cosα
2. cos60° = 1/2
3. a⁻ * b⁻ = 3 * 8 * 1/2 = 12
a⁻ * b⁻ = 12
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Ответ:
1. a⁻ * b⁻ = |a⁻| * |b⁻| * cosα
2. cos60° = 1/2
3. a⁻ * b⁻ = 3 * 8 * 1/2 = 12
a⁻ * b⁻ = 12