Bài `8 :`
`a,\frac{219}{220} = 1 - \frac{1}{220}`
`\frac{217}{218} = 1 - \frac{1}{218}`
`⇒ \frac{1}{218} > \frac{1}{220}`
Do đó `: \frac{219}{220} > \frac{217}{218} `
`b, \frac{-2001}{2008} > -1\frac{1}{2000}`
`\frac{-2021}{2018} = -1\frac{3}{2018}`
`⇒ -1\frac{1}{2000}` `> -1\frac{3}{2018}`
Do đó `: \frac{-2001}{2008} > \frac{-2021}{2018}`
`c,\frac{2012}{2013} + \frac{2013}{2014} = \frac{(2012.2014)+(2013.2013)}{2013.2014}`
Mà ta so sánh tử số `: (2012.2014)+(2013.2013) > 2012 + 2013`
So sánh mẫu số : `2013.2014` `>` `2013` `+` `2014`
Do đó : `\frac{2012}{2013} + \frac{2013}{2014} > \frac{2012+2013}{2013+2014}`
`XIN` `HAY` `NHẤT `NHA`
