1 2 A           A 1 A 1 A (A 1) (A 1)   2 2 2   ( A 1) 1 2 A ( A 1) ( A 1)

Question

Câu 2: a) A =  a 1 2 a : 1 2 a           a 1 a 1 a (a 1) (a 1)   2 2 2   ( a 1) 1 2 a ( a 1) ( a 1): :. =           a 1 a 1 (a 1)( a 1) a 1 ( a 1)(a 1)2( a 1) (a 1)( a 1)  . a 1 a 1 ( a 1)  . b) a = 2011 - 2  2010  ( 2010  1 )2  a  2010  1  Vậy A =  2010 . 1  ta có:

Answer

Câu 2: a) A =  a 1 2 a : 1 2 a           a 1 a 1 a (a 1) (a 1)   2 2 2   ( a 1) 1 2 a ( a 1) ( a 1): :. =           a 1 a 1 (a 1)( a 1) a 1 ( a 1)(a 1)2( a 1) (a 1)( a 1)  . a 1 a 1 ( a 1)  . b) a = 2011 - 2  2010  ( 2010  1 )2  a  2010  1  Vậy A =  2010 . 1  ta có:

1 2 A           A 1 A 1 A (A 1) (A 1)   2 2 2   ( A 1) 1 2 A ( A 1) ( A 1)

Câu 2: a) A = ^{a 1 2 a} : ¹ ^{2 a}

    

      

a 1 a 1 a (a 1) (a 1)

   

 

  

( a 1) 1 2 a ( a 1) ( a 1)

: :

.

=

 

 

        

a 1 a 1 (a 1)( a 1) a 1 ( a 1)(a 1)

( a 1) (a 1)( a 1)

  

. a 1

 

a 1 ( a 1)

  .

b) a = 2011 - 2 2010  ( 2010  1 )

 a  2010  1

Vậy A = 2010 .

1 ta có:

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