Lỗi
6 a
7 b
8 c
4 a
5 c
Việt Nam
Lỗi
A
D
9 d
10 b
11 d
12 b
13c
14 c
19 d
20 d
21 b
22 c
23 a
24 c
2x+3.16=64
2x+3=64:16
2x+3=4
2x=1
x=0 .