. 11 0 . 10 1 10 2 . 2 1 1 01 . 1 1 +++ = ) 11 0 1 10 1 10 2 1 2 1 1 01 1 1( 10 0 1 +++ = ) 11 0 1 10 2 1 1 01 1 ( 10 0 1 ) 10 1 3 1 2 1 1( 10 0 1 +++++++ Xét ) 11 0 1 100 1 12 1 2 1 11 1 1 1 ( 10 1 110 . 10 0 1 . 12 1 2 1 11 1 1 1 ( 10 1 110 . 10 0 1 12 . 2 1 11 1 +++=+++ = ) 11 0 1 10 0 1 12 1 11 1 10 0 1 3 1 2 1 1( 10 1 ++++ = ) 11 0 1 10 2 1 1 01 1 10 1 2 1 1( 10 1 +++ Do đó ta có: x= 10 10 0 1 : 10 1 = . 12 1 11 1 50 1 2 1 1( 10 1 ) 60 1 52 1 51 1 10 1 3 1 2 1 1( 50 1 +++=++++ x ) 60 1 52 1 51 1 10 1 2 1 1( 10 1 ) 60 1 52 1 51 1 10 1 2 1 1( 50 1 +++=+++ x x = 5 50 1 : 10 1 =