Question

[Châu Anh Trần]

A=2/8+ 2/24+ 2/72+ 2/216+ 2/648

Giup mik với, helppp!!!

Answer 1

[Bùi Như Quỳnh]

 2/8 + 2/24 + 2/72 + 2/216 + 2/648 

= 1/4 + 1/12 + 1/36 + 1/108 + 1/324

= 81/324 + 27/324 + 9/324 + 3/108 + 1/324

= 121/324