Tìm x :[x+1]+[x+1/2]+[x+1/4]+[x+1/8]+[x+1/16]=25/8

Đáp án: `x=19/80`

Giải thích các bước giải:

`(x+1)+(x+ 1/2)+(x+ 1/4)+(x+1/8)+ (x+ 1/16)=25/8`

`(x+x+x+x+x)+(1+ 1/2+ 1/4+ 1/8+ 1/16)= 50/16`

`5x+ (16/16+ 8/16+ 4/16+ 2/16+ 1/16)= 50/16`

`5x+ 31/16= 50/16`

`5x= 50/16- 31/16`

`5x=19/16`

  `x=19/16: 5`

  `x=19/80`

`@` Vậy, `x=19/80`

`~` $kiddd$ `~`