Завдання:
(Усно.) Виконай дії:
1) 7 + (–7) + 11;
2) –5 + (–3) + 5;
3) 4 + 7 + (–4) + (–2);
4) –2 ⋅ 50 ⋅ (–3);
5) 7 ⋅ (–12) ⋅ 0;
6) –5 ⋅ 7 ⋅ (–2).
Розв'язок:
1) 7 + (-7) + 11 = 11
2) -5 + (-3) + 5 = -3
3) 4 + 7 + (-4) + (-2) = 5
4) -2 ⋅ 50 ⋅ (-3) = 100 ⋅ 3 = 300
5) 7 ⋅ (-12) ⋅ 0 = 0
6) -5 ⋅ 7 ⋅ (-2) = 10 ⋅ 7 = 70