Question

Реши задачу разными способами. Из котлована нужно вывезти 1200 т земли. Работают 5 семитонных и 4 пятитонных самосвала.Каждая машина за день сделала 15 рейсов. Закончена ли вся работа? Если нет, сколько земли осталось вывезти? Решите плиииз!!!! Зарание спасибо!

Answer 1

Сперва узнаем сколько тонн земли вывезли машины
1)5·7+4·5=55тонны за 1 рейс.
2) 55·15=825 т вывезли
3) 1200-825=375т. осталось.
ответ: работа была не закончена. осталось. 375 тонн.

Answer 2

1способ

1)1200:5=?
2)1200:4=?
3)?+?=?

2способ
1200:5+1200:4=?
Реши сам :сколько получится на знаков ?

Answer 3

To solve this problem, we need to calculate the total amount of earth that can be transported by the trucks and compare it to the amount of earth that needs to be removed.

Let's start by calculating the total capacity of the trucks:

- There are 5 semitonnage trucks, each with a capacity of 7.5 tons. - There are 4 fiveton trucks, each with a capacity of 5 tons.

To find the total capacity of the semitonnage trucks, we multiply the number of trucks by their capacity:

5 semitonnage trucks * 7.5 tons/truck = 37.5 tons

To find the total capacity of the fiveton trucks, we multiply the number of trucks by their capacity:

4 fiveton trucks * 5 tons/truck = 20 tons

Now, let's calculate the total capacity of all the trucks combined:

Total capacity = Capacity of semitonnage trucks + Capacity of fiveton trucks Total capacity = 37.5 tons + 20 tons = 57.5 tons

The trucks can transport a total of 57.5 tons of earth per day.

Next, let's calculate the total amount of earth that needs to be removed, which is given as 1200 tons.

Now, we can determine if all the work is completed or if there is still earth left to be removed.

If the total capacity of the trucks is greater than or equal to the amount of earth that needs to be removed, then all the work is completed. Otherwise, there is still earth left to be removed.

Let's compare the total capacity of the trucks to the amount of earth that needs to be removed:

Total capacity of the trucks = 57.5 tons Amount of earth that needs to be removed = 1200 tons

Since the total capacity of the trucks (57.5 tons) is less than the amount of earth that needs to be removed (1200 tons), it means that all the work is not completed yet.

To find out how much earth is left to be removed, we subtract the total capacity of the trucks from the amount of earth that needs to be removed:

Amount of earth left = Amount of earth that needs to be removed - Total capacity of the trucks Amount of earth left = 1200 tons - 57.5 tons = 1142.5 tons

Therefore, there is still 1142.5 tons of earth left to be removed.

Please let me know if you have any further questions!