Kết quả tìm kiếm

Hi, I am learning at secondary school. It is very nice. There are many trees and flowers in the schoolyard. There are over six hundred students and about 45 teachers in my school. My school has nineteen classes and 3 floors. I am in class 7A. It on the second floors . At recess, the students...

Cho dãy số : 2 , 5 , 8 , 12 ,... Tìm số thứ 40 . Tìm tổng số của số 40 của dãy trên