Question

HELP Ạ

Answer 1

`<=> (x+3) . (1/22 +1/23 + 1/24 - 1/25 - 1/26) = 0`

Mà vế phải bé hơn `0`

`=> x +3=0`

`=> x=-3`

Answer 2

=>(x+3)(1/22+1/23+1/24-1/25-1/26)=0

=>x+3=0

hay x=-3