CÂU 48. [1D3-3.4-4] CHO KHAI TRIỂN    1  1 2  1 3   ... 1 2...

1.0 2.1 3. 1 2 .... 2016. 1 2 ... 2015 2017. 1 2 ... 2016

   

         

2 1. 1 2 ... 2017 2. 1 2 ... 2017 ...

a

2

 

       

2

2

2

... 2017.(1 2 ... 2017) 1 2 ... 2017

Khi đó, ta có

T a a    

2 1 2 ... 2017

1 1 2 ... 2017

     

2

2

2

2

2 2

1 1. 1 2 ... 2017 2. 1 2 ... 2017 ... 2017. 1 2 ... 2017

     

                 

2

 

1 2017.2018 2017.2018 1 2017.2018

       

2 2 2 2 2