a) −3x(2x − 1) = −3x ⋅ 2x −3x ⋅ (−1) = −6x² + 3x
б) (2a − b) ⋅ 8b + 8b² = 2a ⋅ 8b − b ⋅ 8b + 8b² = 16ab − 8b² + 8b² = 16ab
Ответ: a) −6x² + 3x; б) 16ab