Giải thích các bước giải :
`e)` `(` `7``1/3` `-` `1/3` `)` `:` `1/7`
`=` `(` `22/3` `-` `1/3` `)` `:` `1/7`
`=` `7` `:` `1/7`
`=` `7` `.` `7/1`
`=` `49`
`f)` `(` `2/7` `-` `1/4` `)` `:` `3``1/5`
`=` `(` `8/28` `-` `7/28` `)` `:` `3``1/5`
`=` `1/28` `:` `16/5`
`=` `1/28` `.` `5/16`
`=` `5/448`
`g)` `10/17` `-` `5/13` `-` `-7/17` `-` `8/13` `+` `11/15`
`=` `(` `10/17` `-` `-7/17` `)` `+` `(` `-5/13` `-` `8/13` `)` `+` `11/15`
`=` `(` `10/17` `+` `7/17` `)` `+` `-13/13` `+` `11/15`
`=` `1` `+` `(` `-1` `)` `+` `11/15`
`=` `11/15`
