Bài `2:`
`(x+1/2)+(x+1/4)+(x+1/8)+(x+1/16)=1`
` x+1/2+x+1/4+x+1/8+x+1/16=1`
`4x+15/16=1`
`4x=1-15/16`
`4x=1/16`
`=> x=1/16 :4=1/64`
`1. 3 1/11 xx 27/46 xx 1 6/17 xx 2 4/9`
`= 34/11 xx 27/46 xx 23/17 xx 22/9`
`= 6`
2. `= 4x + 15/16 = 1`
`=> 4x = 1/16`
`x = 1/64`.