Trung bình cộng của ba số là 37 . Tìm ba số đó biết rằng trong ba số đó có một số có ba chữ số , một số có hai chữ số , một số có 1 chữ số.
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Cuong co so vien keo la:
( 24+28):3=14( vien keo)
dap so: 14 vien keo.

4800 : ( X x 16 ) = 25
X x 16 = 4800 : 25
X x 16 = 192
X = 192 : 16
X = 12
2009 : ( 71 : x ) = 2009
71 : x = 2009 : 2009
71 : x = 1
x = 71 : 1
x = 71
4800 : ( x . 16 ) = 25
x . 16 = 4800 : 25
x . 16 = 192
x = 192 : 16
x = 12

I usually get up early in the morning. After brushing my teeth, having breakfast, I go to school. My school is not very far from my house, so I always go by bike. It's very interesting to travel by bike. it helps keep the environment clean. My classes always finish at 11:15. I and my friends have lunch at school. Our lunch time is about 2 hours. Our practising lessons begin at 2:10 pm. We review and practise what we have learnt in the morning, we do our exercises and do labour work in the school garden. It's always interesting time for work and passion. We also have short break for relax in the afternoon. Our schooling of the afternoon often ends at 3:00 o'clock. We come back home and have dinner with family at home. It's a great time to stay with the family after a hard working day. In the evening, we usually watch TV, or listen to music. Sometimes we go to the cinemar. It's usually at weekend. Time in the family is always pleasure but I also love my school and my friends very much.
I usually get up early in the morning. After brushing my teeth, having breakfast, I go to school. My school is not very far from my house, so I always go by bike. It's very interesting to travel by bike. it helps keep the environment clean. My classes always finish at 11:15. I and my friends have lunch at school. Our lunch time is about 2 hours. Our practising lessons begin at 2:10 pm. We review and practise what we have learnt in the morning, we do our exercises and do labour work in the school garden. It's always interesting time for work and passion. We also have short break for relax in the afternoon. Our schooling of the afternoon often ends at 3:00 o'clock. We come back home and have dinner with family at home. It's a great time to stay with the family after a hard working day. In the evening, we usually watch TV, or listen to music. Sometimes we go to the cinemar. It's usually at weekend. Time in the family is always pleasure but I also love my school and my friends very much.

CHiều dài mảnh đất là:
576:18=32(m)
Chu vi mảnh đất là:
32+18=50(m)
Đ/S:50 m
Chiều dài mảnh đất hình chữ nhật là:
576:18=32(m)
Chu vi mảnh đất hình chữ nhật là:
(32+18).2=100(m)
Đáp số: 100m

mỗi học sinh được số quả cam là:
925/37.18:30=15(quả cam)
D/S:15 quả cam