TÍTÍNNHH TỔTỔNNGG C20210 C20211 C20212 ... C10102021....
Câu 14. TíTínnhh tổtổnngg
C
2021
0
C
2021
1
C
2021
2
... C
1010
2021
. A.2
2020
B.2
2019
C.2
2021
1
D.2
2021
2021
0
2021
1
2021
2
1010
2021
. A.2020
B.2019
C.2021
2021