2   X X X X X X X1 1 (1 ) (1 ) (1 )(1 )(1 )        ...

2 . - DE CUONG ON THI TOAN 8 HK1 CO DAP AN
Toán DE CUONG ON THI TOAN 8 HK1 CO DAP AN

2 . 2

   

x x x x x x x

1 1 (1 ) (1 ) (1 )(1 )(1 )

 

        

=

1 3 2

1 3 1 1

x x

x x x x

 

   