Вычислите удобным способом: a) 0,05 ⋅ 2,3 ⋅ 2; б) 4 ⋅ 7,2 ⋅ 2,5; в) 0,125 ⋅ 7,2 ⋅ 8; г) 5 ⋅ 0,4 ⋅ 0,25 ⋅ 40.

Решение:

• а) 0,05 ⋅ 2,3 ⋅ 2 = (0,05 ⋅ 2) ⋅ 2,3 = 0,1 ⋅ 2,3 = 0,23
• б) 4 ⋅ 7,2 ⋅ 2,5 = (4 ⋅ 2,5) ⋅ 7,2 = 10 ⋅ 7,2 = 72
• в) 0,125 ⋅ 7,2 ⋅ 8 = (0,125 ⋅ 8) ⋅ 7,2 = 1 ⋅ 7,2 = 7,2
• г) 5 ⋅ 0,4 ⋅ 0,25 ⋅ 40 = (5 ⋅ 0,4) ⋅ (0,25 ⋅ 40) = 2 ⋅ 10 = 20

Ответ: а) 0,23; б) 72; в) 7,2; г) 20