Are you cool

My school is very big and beautiful. It has 5 floors, about 32 classrooms and many rooms. There are: 2 teacher rest rooms, a canteen, a library,... iN canteen, I can eat fast food or drink water after the lesson. I like library beacause I can read book and learn something or use the computer. But you must be quiet. In my school, it has a lot of student study in here. The teachers is friendly. They teach us very easy to understand. I love my school very much

ab+ba=10a+b+10b+a=11a+11b=11(a+b)=154=>a+b=154:11=14

có a-b=2

nên a=8;b=6 thỏa mãn

Đọc các số viết bằng chữ số La Mã sau đây:

I, III, V, VII, IX , XI,XXI