Tính nhanh: a) [(–17,015) + 3,202] + [19,015 + (–3,202)]
Giải thích
a) [(–17,015) + 3,202] + [19,015 + (–3,202)] = –17,015 + 3,202 + 19,015 – 3,202
= –17,015 + 19,015 + (3,202 – 3,202) = (–17,015 + 19,015) + 0 = 2.
a) [(–17,015) + 3,202] + [19,015 + (–3,202)] = –17,015 + 3,202 + 19,015 – 3,202
= –17,015 + 19,015 + (3,202 – 3,202) = (–17,015 + 19,015) + 0 = 2.