`text{Đáp án :}`
`text{a)}` `2/3` + `1/6` - `1/2` = `12/18` + `3/18` - `9/18` = `15/18` - `9/18` = `6/18` = `1/3`
`text{b)}` `1/4` + `2/3` x `3/4` = `1/4` + `1/2` = `1/4` + `2/4` = `3/4`
`text{c)}` `1/6` x `2/3` : `2/9` = `2/18` : `2/9` = `2/18` x `9/2` = `18/36` = `1/2`
`text{d)}` `7/8` - `5/12` : `5/6` = `7/8` - `5/12` x `6/5` = `7/8` - `30/60` = `7/8` - `3/6` = `42/48` - `24/48` = `18/48` = `3/8`
`text{e)}` `1/2` x `2/3` x `3/5` = `2/6` x `3/5` = `6/30` = `1/5`
`text{f)}` `1/2` : `2/3` : `3/5` = `1/2` x `3/2` x `5/3` = `3/4` x `5/3` = `15/12` = `5/4`