Question

\(\dfrac{6}{5}\) + \(\dfrac{3}{5}\) + .....= 2

A.\(\dfrac{1}{2}\)                   B.\(\dfrac{2}{10}\)                  C.\(\dfrac{3}{4}\)                    D.\(\dfrac{1}{8}\) 

Answer 1

`6/5 + 3/5 + ... =2`

`=> 2- 6/5 -3/5= 10/5 - 6/5 -3/5=1/5`

Mà `1/5=2/10`

`->B`

Answer 2

` 6/5+3/5+...=2`

`9/5+...=2`

`2-9/5=...`

`10/5-9/5=1/5`

`1/5=2/10`

=> Chọn đáp án `B`

Answer 3

Ta có: \(\dfrac{6}{5}+\dfrac{3}{5}+...=2\)

\(\dfrac{9}{5}+...=2\)

\(...=2-\dfrac{9}{5}\)

\(...=\dfrac{10}{5}-\dfrac{9}{5}\)

\(...=\dfrac{1}{5}\)

Mà \(\dfrac{1}{5}=\dfrac{2}{10}\)

`->` Đáp án B.