So sánh A = 2010/2011 + 2011/2012 + 2012/2013 B = 2010 + 2011 + 2012/ 2011 + 2012 + 2013 Help me > . <

0 bình luận về “So sánh A = 2010/2011 + 2011/2012 + 2012/2013 B = 2010 + 2011 + 2012/ 2011 + 2012 + 2013 Help me > . <”

1. lời giải:

   `2010/2011` > `2010/2011+2012+2013`

   `2011/2012` > `2011/2011+2012+2013`

   `2012/2013` > `2012/2011+2012+2013`

   Nên: `2010/2011`+`2011/2012`+`2012/2013` >`2010 + 2011 + 2012 / 2011 + 2012 + 2013`

   => A>B

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2. Ta có:

   `2010/2011>(2010 )/ (2011 + 2012 + 2013)`

   `2011/2012>(2011 )/ (2011 + 2012 + 2013)`

   `2012/2013>(2012 )/ (2011 + 2012 + 2013)`

   `⇒2010/2011 + 2011/2012 + 2012/2013>(2010 + 2011 + 2012)/ (2011 + 2012 + 2013)`

   Vậy $A>B$.

    

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