số chính phương nhỏ nhất có 3 chữ số là 10^2

Hai số tự nhiên liên tiếp có tổng bằng 2011 là:
(2011+1):2=1006
(2011-1):2=1005
Vì khoảng giữa có 9 số chẵn nên ta có:
Số nhỏ là:1005-9=996
Số lớn là:1006+9=1015

mik làm rồi nha

Đọc đoạn văn và nhận định các câu dưới đây là đúng (True) hay sai (False). 
It’s six o’clock in the evening. Many people are at home. They are having dinner. They are watching T.V. They are listening to music. But Mrs Lan is going to work. She’s a doctor and she works at night in the hospital. Today she’s late. The hospital is not in her neighborhood so she usually goes by car. Mrs Lan is in her car now. She’s driving fast. She should slow down but she must be at work by six thirty. A policeman stops her. “You are driving too fast!” he says. "You are going to have an accident". It’s six thirty. Mrs Lan is not at the hospital. She’s at the police station. Her car must stay there for fourteen days.
1.
Many people are not working.
A. True
B. False
2.
Mrs Lan comes home every evening at six.
A. True
B. False
3.
Mrs Lan is a nurse.
A. True
B. False
4.
The hospital is near her house.
A. True
B. False
5.
Mrs Lan goes to work by motorbike.
A. True
B. False

số hs  của lớp đó:

18:60 x100=30 hs

số hs nam của lớp đó:

30-18=12 hs 

Đáp số:12 hs nam

Many