2 2 2A BC B AC C AB   ( )( ) ( )( ) ( )( )A B A C B A B C A C A B...

câu 1: - DE THI HSG TOAN LOP 8 CO DAP AN
DE THI HSG TOAN LOP 8 CO DAP AN

Câu 1:

2

2

2

a bc b ac c ab

  

 

( )( ) ( )( ) ( )( )

a b a c b a b c a c a b

     

Rút gọn: M =