 =  =  12 2111 2 2 2 1  . 1 2 1 TA CÓ

Bài 5:

 =

 =  

1

2 

2

1

2

2 2 1  . 1 2 1

Ta có: x =

17 

12

41

3 

29 

7

5 

 x

2

=

; x

4

(x

2

)

2

=

; x

3

= x.x

2

=

; x

5

= x.x

4

=

4

32

16

8

29          

34

24

25

35

20

Do đó: 4x

5

+ 4x

4

 5x

3

+ 5x  2 = 1

Vậy A = (4x

5

+ 4x

4

 5x

3

+ 5x  2)

2014

+ 2015 = (1)

2014

+ 2015 = 1 + 2015 = 2016

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