1, Tính tổng
A= 10/56 + 10/140 + 10/260 +....+ 10/1400
Tính B=1-10/56-10/140-10/260-...-10/1400
tính M=10/56+10/140+1/26+...+10/1400
Tính tổng A=10\56+10\140+10\260+..+10\1400
Tính tổng:A=10/56+10/140+10/260+.........+10/1400
tính: 10/56+10/140+10/260+...+10/1400
Tính tổng : 10/56 + 10/140 + 10/260...+10/1400
tính nhanh 10/56+10/140+10/260+...+10/1400
tính tong 10/56 + 10/140 + 10/260 + ..... + 10/1400