Завдання:
Обчисли зручним способом:
1) 4 ⋅ 89 ⋅ 25;
2) 2 ⋅ 472 ⋅ 5;
3) 5 ⋅ 61 ⋅ 4;
4) 50 ⋅ 15 ⋅ 2;
5) 125 ⋅ 14 ⋅ 8;
6) 8 ⋅ 36 ⋅ 25.
Розв'язок:
1) 4 ⋅ 89 ⋅ 25 = 4 ⋅ 25 ⋅ 89 = 100 ⋅ 89 = 8900
2) 2 ⋅ 472 ⋅ 5 = 2 ⋅ 5 ⋅ 472 = 10 ⋅ 472 = 4720
3) 5 ⋅ 61 ⋅ 4 = 5 ⋅ 4 ⋅ 61 = 20 ⋅ 61 = 1220
4) 50 ⋅ 15 ⋅ 2 = 15 ⋅ 2 ⋅ 50 = 30 ⋅ 50 = 1500
5) 125 ⋅ 14 ⋅ 8 = 125 ⋅ 8 ⋅ 14 = 1000 ⋅ 14 = 14 000
6) 8 ⋅ 36 ⋅ 25 = 8 ⋅ 25 ⋅ 36 = 200 ⋅ 36 = 7200