bài 3:

3'45s = 255s

4h4' < 404'

1/12h = 6'

1/4' < 1/5'

Tham khảo :

Most recently, the Ministry of Natural Resources and Environment has given "startling" numbers in the reporting environment. Specifically, every year our country consumes 10,000 tons of real protective chemicals, 2.3 tons of domestic waste, 7 million tons of active solids... as a result, the problem of the environment has never returned to the hot spot as it is now. .

Mẹ hơn con 24 tuổi. Trước đây 4 năm tuổi con bằng 1/4 tuổi mẹ. Hỏi năm nay mẹ và con bao nhiêu tuổi ?