A) A = A 1 2 A 1 2 AA 1

Question

Câu 2:a) A = a 1 2 a 1 2 aa 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1Vậy A = 2010 .1 ta có:

Answer

Câu 2:a) A = a 1 2 a 1 2 aa 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1Vậy A = 2010 .1 ta có:

A) A = A 1 2 A 1 2 AA 1

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