21 1 (1 ) (1 )(1 )X X X X X        = 1 3 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

1 1 (1 ) (1 )(1 )

x x x x x

 

      

=

1 3 1.(1 ) 1.(1 )

 

x x x x

  