there are 10 lamp posts along a stretch of a road. In between every 2 lamp posts there are 2 trees. How many trees are there along that stretch of road?
K
Khách
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16 tháng 2 2017
Dịch : Các cột đèn được dựng lên dọc theo lề đường cách nhau 8 m.Các dấu rạch được tạo ra trên lề đường cách nhau 12 m.Hỏi có bao nhiêu dấu rạch kề bên cột đèn dọc theo con đường dài 240m.
Giải : Khoảng cách từ đầu đường tới 1 cột đèn bất kì là bội của 8,khoảng cách từ đầu đường tới 1 dấu rạch bất kì là bội của 12 nên khoảng cách từ đầu đường tới dấu rạch có cột đèn bên cạnh là BC(6 ; 8).
Xét 6 = 2.3 ; 8 = 23 nên BCNN(6 ; 8) = 23.3 = 24.Vậy các dấu rạch có cột đèn bên cạnh cách nhau 24m.Số dấu rạch như vậy trên đoạn đường dài 240m là : (240 - 0) : 24 + 1 = 11
KC
9 tháng 7 2018
Có 61 cây thường xuyên từ đầu đường đến cuối của nó. Khoảng cách giữa hai cây liên tiếp là 3m. Đường dài bao lâu?
giống như chăn lẻ vậy
chặn là cây
lẻ là đường
chặn , lẻ cứ như vậy khi mô đủ 61 chặn
có tất cả số lẻ là : 61 x 2 - 61 = 61 lẻ => có 61 đường
đường dài só mét là : 61 x 3 = 183 m
16 tháng 6 2018
Bài 1: First task:
Let \(x\) be the number of sparrows on the first lamp post at first. (\(x\) is a positive integer).
\(\Rightarrow16-x\)is the number of sparrows on the second lamp post at first.
We have: \(x-2+3=16-x+2-3\Leftrightarrow2x=14\Leftrightarrow x=7\)
Hence there are 7 sparrows on the first lamp post at first, 9 sparrows on the second lamp post at first.
Bài 2: Second Task
We can find 2 students who were born on the same day.
There are 30 days in April and 31 students were born on that month. Apply the Dirichlet 's theorem, we can ensure that threre exists at least one day where 2 students were born.
17 tháng 3 2016
ta có 12-11=1 côt thì 30 phút thì ông đi đc là 30+1=31 cây đc 31 cột
17 tháng 3 2016
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25 tháng 7 2017
Read and answer the questions
Last night in Cowford many trees were blown down in the storm. One tree fell across the main road in Cổd. It was taken away by the fire service during the night. Heavy rain also caused problems on the roads. Some roads were coverecd by half a metre of water. Many motorists left their cars and walked home. The situation this moring is better and nearly back to normal. The last few cars are being removed by the emergency services at the moment. The broken lines are being repaired. The traffic is now moving in and out of the town along the again roads.
1. When were many trees blown down in Cowford?
Last night in Cowford many trees were blown down in the storm.
2. How many trees fell across the main road?
One tree fell across the main road
3. Was it taken away by the fire service?
yes, it was.
4. What were covered by half a metre of water?
Some roads were covered by half a metre of water.
5. Are the broken lines being repaired now?
Yes, they are.
LD
25 tháng 7 2017
Read and answer the questions
Last night in Cowford many trees were blown down in the storm. One tree fell across the main road in Cổd. It was taken away by the fire service during the night. Heavy rain also caused problems on the roads. Some roads were coverecd by half a metre of water. Many motorists left their cars and walked home. The situation this moring is better and nearly back to normal. The last few cars are being removed by the emergency services at the moment. The broken lines are being repaired. The traffic is now moving in and out of the town along the again roads.
1. When were many trees blown down in Cowford?
many trees were blown down in Cowford Last night
2. How many trees fell across the main road?
One tree fell across the main road
3. Was it taken away by the fire service?
yes, it was
4. What were covered by half a metre of water?
Some roads were covered by half a metre of water
5. Are the broken lines being repaired now?
yes, they are
VB
10 tháng 10 2019
1. trees / many / park / are / the / there / ? / in
Are there many trees in the park?
2. next / house / bank / is / the / to / the
The house is next to the bank
3. a / is / my / garden / there / big / house / behind
There is a big garden behind my house
4. many / how / students / there / school / Lan's / in / are / ?
How many people are there in Lan's school?
5. front / a / house / there / of / yard / your / is / in / small / ?
Is there a yard in front of your small house ?
nếu tính ngoài lề luôn là 20 còn nếu không tính ngoài lề là 18