10,11+11,12+12,13+....+97,98+98,99+99,100
10,11 + 11,12 + 12,13 + ... + 97,98 + 98,99 + 99,100
10,11 + 11,12 + 12,13 + ... + 97,98 + 98,99 + 99,100
10,11+11,12+12,13+...+97,98+98,99+99,100 = ?
10,11+11,12+12,13+.........97,98+98,99+99,100
Tính 10,11+11,12+12,13+13,14+...+97,98+98,99+99,100 =
Tính nhanh : 10,11+ 11,12+ 12,13+ ....+97,98+ 98,99+ 99,100
Tính hợp lý: 10,11+11,12+12,13+...+97,98+98,99+99,100
Tính nhanh
10,11 + 11,12 + 12,13 + .........+ 97,98 + 98,99 + 99,100
