So sánh 2005/2006 và 2006/2007
So sánh \(\frac{{2005}}{{2006}}\) và \(\frac{{2006}}{{2007}}\).
So sánh \(\frac{{2005}}{{2006}}\) và \(\frac{{2006}}{{2007}}\).
Ta xét: 1 – \(\frac{{2005}}{{2006}} = \frac{1}{{2006}}\)
1 – \(\frac{{2006}}{{2007}} = \frac{1}{{2007}}\)
Ta thấy: \(\frac{1}{{2006}}\)> \(\frac{1}{{2007}}\)nên : 1 – \(\frac{{2005}}{{2006}}\)> 1 –\(\frac{{2006}}{{2007}}\)
Suy ra: \(\frac{{2005}}{{2006}}\) < \(\frac{{2006}}{{2007}}\).