Номер 1092
Обчисли, ураховуючи, що a + (-a) = 0:
1) 9 + (–9) + 5 = (9 + (–9)) + 5 = 0 + 5 = 5
2) –12 + (–3) + 3 = –12 + ((–3) + 3) = –12 + 0 = –12
3) –4 + 11 + 4 = (–4 + 4) + 11 = 0 + 11 = 11
Обчисли, ураховуючи, що a + (-a) = 0:
1) 9 + (–9) + 5 = (9 + (–9)) + 5 = 0 + 5 = 5
2) –12 + (–3) + 3 = –12 + ((–3) + 3) = –12 + 0 = –12
3) –4 + 11 + 4 = (–4 + 4) + 11 = 0 + 11 = 11