Câu 12:
2 2 2 2 2 2 2a b c b a c a c a c b b b a c
( ) ( ) ( ) 2( ) ( )
( ) ( ) ( ) 2 ( ) ( )
a b c a b c b c a b c a a b c
22( ) 2 ( ) ( )( )
a c b a c a c a c b a c
b c a b c b c b c a b c
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