a) 6 ⋅ k ⋅ 24 = 6 ⋅ 24 ⋅ k = 144k
б) 25 ⋅ 79 ⋅ y ⋅ 4 = 25 ⋅ 4 ⋅ 79 ⋅ y = 100 ⋅ 79 ⋅ y = 7900y
Ответ: a) 144k; б) 7900y