( 5 ĐIỂM)+= +++.7.9(1362.33.4)7 = =212719.7.914.A) (2ĐIỂM) A = ++++2...
5 )
5 + + + + = .(
5
=
.
28
4
7
25
13
10
3
.( 1
1 − + − + − + + − = − = =
1
) 5
.. 1
. 6
= .(
...
14
c)(1,5điểm) Ta có 2009
2010
+ 2009
2009
= 2009
2009
( 2009 + 1 ) = 2009
2009
. 2010
2010
2010
= 2010
2009
. 2010
Vì 2009
2009
< 2010
2009
=> 2009
2010
+ 2009
2009
< 2010
2010