Завдання:
(Усно.) Обчисли:
1) 7 + (–4) + 1;
2) –2 + 4 + (–3);
3) –2 + (–7) + 4;
4) 4 + (–2) + (–7) + 5.
Розв'язок:
1) 7 + (-4) + 1 = 4;
2) -2 + 4 + (-3) = -1;
3) -2 + (-7) + 4 = -5;
4) 4 + (-2) + (-7) + 5 = 0.
(Усно.) Обчисли:
1) 7 + (–4) + 1;
2) –2 + 4 + (–3);
3) –2 + (–7) + 4;
4) 4 + (–2) + (–7) + 5.
1) 7 + (-4) + 1 = 4;
2) -2 + 4 + (-3) = -1;
3) -2 + (-7) + 4 = -5;
4) 4 + (-2) + (-7) + 5 = 0.