Question

За день Оля прочитала 25 страниц книги: утром 5 страниц, днём 8 страниц. Сколько страниц Оля прочитала вечером? Реши задачу разными способами. На пишите краткую запись к задачам и пояснения за скобками что мы нашли пожалуйста очень надо за ранее спасибо

Answer 1

1 способ   25-5-8=12

2 способ   25-(5+8)=12

Answer 2

Problem Analysis

The problem states that Olga read 25 pages of a book in one day, with 5 pages in the morning and 8 pages during the day. We need to find out how many pages Olga read in the evening.

Solution 1: Subtraction

One way to solve this problem is by subtracting the number of pages read in the morning and during the day from the total number of pages read in one day.

Let's denote the number of pages Olga read in the evening as x.

The total number of pages read in one day is 25 pages. The number of pages read in the morning is 5 pages. The number of pages read during the day is 8 pages.

To find the number of pages read in the evening, we can subtract the sum of the pages read in the morning and during the day from the total number of pages read in one day:

x = 25 - (5 + 8)

Simplifying the equation:

x = 25 - 13

Therefore, Olga read 12 pages in the evening.

Solution 2: Addition

Another way to solve this problem is by adding the number of pages read in the morning and during the day and then subtracting it from the total number of pages read in one day.

Let's denote the number of pages Olga read in the evening as x.

The total number of pages read in one day is 25 pages. The number of pages read in the morning is 5 pages. The number of pages read during the day is 8 pages.

To find the number of pages read in the evening, we can subtract the sum of the pages read in the morning and during the day from the total number of pages read in one day:

x = 25 - (5 + 8)

Simplifying the equation:

x = 25 - 13

Therefore, Olga read 12 pages in the evening.

Solution 3: Using Variables

We can also solve this problem using variables. Let's denote the number of pages Olga read in the evening as x.

The total number of pages read in one day is 25 pages. The number of pages read in the morning is 5 pages. The number of pages read during the day is 8 pages.

We can set up the equation:

5 + 8 + x = 25

Simplifying the equation:

13 + x = 25

Subtracting 13 from both sides:

x = 25 - 13

Therefore, Olga read 12 pages in the evening.

Conclusion

In conclusion, Olga read 12 pages in the evening. We can solve this problem by subtracting the sum of the pages read in the morning and during the day from the total number of pages read in one day, or by setting up an equation and solving for the number of pages read in the evening.