( 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