BÀI 1. 4 3 3
2) Ta có A C . I
3
, suy ra
C A
1
2016
4 3 3 4 3 3 2016
1
2016
2016
1
2 3 2 . . 2 3 2 . . . ..
A B C A B C A B A
AB A
Ta có
4 4 3 4 4 3Vậy
2016
2016
2016
2016
4 3 3 1 3 1 1 0 0 0 2 1 3.2 2 2.3 3 3 3.2 2016
2017
2017
2017
2 3 2 2 2 1 0 2 0 1 1 1 2 2 2 1 2 2 4 2018
2018
2018
4 4 3 3 4 2 0 0 1 2 5 4 2 4 2 5 2