Tính: 1 + (-3) + 5 + (-7) + 9 + (-11)
Giải thích
1 + (–3) + 5 + (–7) + 9 + (–11)
= [1 + (–3)] + [5 + (–7)] + [9 + (–11)]
= (–2) + (–2) + (–2)
= (–4) + (–2) = –6.
1 + (–3) + 5 + (–7) + 9 + (–11)
= [1 + (–3)] + [5 + (–7)] + [9 + (–11)]
= (–2) + (–2) + (–2)
= (–4) + (–2) = –6.