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Alexandraghita4
a fost răspuns

x=1/2008 + 1/2009 + 1/2010 + 1/2011
y=2007/2008 + 2008/2009 + 2009/2010+ 2010/2011
Calculati
x + y
Dau coroana.

Răspuns :

Aledan
x+y = 1/2008 + 1/2009 + 1/2010 + 1/2011 + 2007/2008 + 2008/2009 + 2009/2010 + 2010/2011 
x+y = 1/2008 + 2007/2008 + 1/2009 + 2008/2009 + 1/2010 + 2009/2010 + 1/2011 + 2010/2011  (am grupat termenii convenabil)
x+y = 2008/2008 + 2009/2009 + 2010/2010 + 2011/2011 
x+y = 1+1+1+1
x+y = 4

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