Thực hiện phép tính
----- Nội dung ảnh -----
4: Thực hiện phép tính
1) (–13) + (–6) + (–12)
2) (–4) + (–8)
3) (–20) + (–1) + (–19)
4) (–9) + (–4) + (–9)
5) (–33) + (–4)
6) (–15) + (–25) + (–35)
7) (–17) + (–23) + 44
8) (–39) + (–1)
9) 5 + (–97) + 49
10) 65 + (–42)
11) 48 + (–3) + (–350)
12) 456 + (–21) + (–96)
13) 68 + (–47) + (–65)
14) (–66) + (–34) + 39
15) 12 + (–2021) + (–544)