题目内容
若a=
,b=
,c=
,则有( )
| 2005×2006 |
| 2007×2008 |
| 2006×2007 |
| 2008×2009 |
| 2007×2008 |
| 2009×2010 |
分析:因b,a都是大于0的数,所以用除法比大小,如:a÷b=
÷
=
×
=
=
<1,所以a<b;同理b<c,即a<b<c.
| 2005×2006 |
| 2007×2008 |
| 2006×2007 |
| 2008×2009 |
| 2005×2006 |
| 2007×2008 |
| 2008×2009 |
| 2006×2007 |
| (2007+2)×(2007-2) |
| 2007×2007 |
| 2007×2007-4 |
| 2007×2007 |
解答:解:a÷b=
÷
=
×
=
=
<1,所以a<b;
b÷c=
÷
=
×
=
=
=
<1,所以b<c;
所以a<b<c;
故选:D.
| 2005×2006 |
| 2007×2008 |
| 2006×2007 |
| 2008×2009 |
| 2005×2006 |
| 2007×2008 |
| 2008×2009 |
| 2006×2007 |
| (2007+2)×(2007-2) |
| 2007×2007 |
| 2007×2007-4 |
| 2007×2007 |
b÷c=
| 2006×2007 |
| 2008×2009 |
| 2007×2008 |
| 2009×2010 |
| 2006×2007 |
| 2008×2009 |
| 2009×2010 |
| 2007×2008 |
| 2006×2010 |
| 2008×2008 |
| (2008-2)×(2008+2) |
| 2008×2008 |
| 2008×2008-4 |
| 2008×2008 |
所以a<b<c;
故选:D.
点评:解救这类问题,应仔细观察,发现规律或技巧,灵活解答.
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