Решение задания №3
- a) $$4 \times 121 \times 25 = (4 \times 25) \times 121 = 100 \times 121 = 12100$$
- б) $$125 \times 12 \times 8 = (125 \times 8) \times 12 = 1000 \times 12 = 12000$$
- в) $$20 \times 13 \times 30 = (20 \times 30) \times 13 = 600 \times 13 = 7800$$
- г) $$200 \times 29 \times 500 = (200 \times 500) \times 29 = 100000 \times 29 = 2900000$$
Ответ: a) 12100; б) 12000; в) 7800; г) 2900000