Dọc một bên đường từ nhà Minh đến nhà Huy dài 2km 40m người ta dựng các cột đèn, cột nọ các cột kia 20m. Hỏi số cột đèn phải dựng là bao nhiêu biết cổng nhà hai bạn đều có đèn?
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![](https://rs.olm.vn/images/avt/0.png?1311)
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\(\text{Giải}\)
\(\text{Đổi 1/5 giờ = 12 phút}\)
\(\text{Nam chạy một phút thì được số mét là :}\)
\(\text{324 : 12 = 27 ( m )}\)
\(\text{Đáp số : 27 m}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Vô tận 999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
cái ni mi hỏi tau mần chi Hông biết à