Вычислите удобным способом: а) 0,05⋅2,3⋅2; б) 0,125⋅7,2⋅8; в) 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) 0,125 ⋅ 7,2 ⋅ 8 = 0,125 ⋅ 8 ⋅ 7,2 = 1 ⋅ 7,2 = 7,2

в) 5 ⋅ 0,4 ⋅ 0,25 ⋅ 40 = (5 ⋅ 0,4) ⋅ (0,25 ⋅ 40) = 2 ⋅ 10 = 20

Ответ:

а) 0,23

б) 7,2

в) 20