Question

[LINH ĐẬU]

Tính nhanh tổng sau:

2/9 + 6/27 + 8/36 + 12/54 + 16/72 + 18/81

Answer 1

[Nguyễn Khánh Ly]

2/9 + 6/27 + 8/36 + 12/54 + 16/72 + 18/81=\(\frac{2}{9}+\frac{2}{9}+\frac{2}{9}+\frac{2}{9}+\frac{2}{9}+\frac{2}{9}\)  = \(\frac{2}{9}\). 6 = \(\frac{12}{9}\)= \(\frac{4}{3}\)

Answer 2

[★luffyッcute★(Team ASL)]

\(\frac{2}{9}+\frac{6}{27}+\frac{8}{36}+\frac{12}{54}+\frac{16}{72}+\frac{18}{81}\)

\(=\frac{2}{9}+\frac{2}{9}+\frac{2}{9}+\frac{2}{9}+\frac{2}{9}+\frac{2}{9}\)

\(=\frac{2}{9}×6=\frac{4}{3}\)