Ответ:
1. ā × b = |a| × |b| × cos "гамма" = 3 × 2 × (-1/2) = -3
2. ā × b = x¹ × x² + y¹ × y² = -4 × 2 + 5 × -(-1) = -8 + 5 = -3
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Answers & Comments
Ответ:
1. ā × b = |a| × |b| × cos "гамма" = 3 × 2 × (-1/2) = -3
2. ā × b = x¹ × x² + y¹ × y² = -4 × 2 + 5 × -(-1) = -8 + 5 = -3