b) [(–4,19) + (–15, 06)] + [5,19 + 15,06].
Giải thích
b) [(–4,19) + (–15,06)] + [5,19 + 15,06] = –4,19 – 15,06 + 5,19 + 15,06
= (–4,19 + 5,19) + (15,06 – 15,06) = 1 + 0 = 1.
b) [(–4,19) + (–15,06)] + [5,19 + 15,06] = –4,19 – 15,06 + 5,19 + 15,06
= (–4,19 + 5,19) + (15,06 – 15,06) = 1 + 0 = 1.