гдз математика 6 клас мерзляк

Вправа 963

1) –7 + (–6) + (–5) + (–4) + (–3) + (–2) + (–1) + 0 + 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 8 + 9 + 10 = 27;
2) –9 + (–8) + (–7) + (–6) + (–5) + (–4) + (–3) + (–2) + (–1) + 0 + 1 + 2 + 3 + 4 + 5 = –9 + (–8) + (–7) + (–6) = –30.