Question

Как ришить задачу:Для школьной библиотеки закупили словори и учебники на 7000р.За словари заплатили тринадцать сотых всех денег.Сколько стоили учебники?

Answer 1

1) 7000*13/100 (это дробь) =7000*0,13=910 - рублей заплатили за словари
2) 7000 - 910 = 6090 - рублей стоили учебники 
Ответ: 6090 рублей стоили учебники.

Answer 2

Problem:

Для школьной библиотеки закупили словари и учебники на 7000 рублей. За словари заплатили тринадцать сотых всех денег. Сколько стоили учебники?

Solution:

To find out how much the textbooks cost, we need to subtract the amount spent on dictionaries from the total amount spent on books.

Let's denote the cost of textbooks as x.

According to the problem, the cost of dictionaries is thirteen hundredths (13/100) of the total amount spent on books, which is 7000 rubles.

Mathematically, we can represent this as:

13/100 * (x + 7000) = 7000

To solve this equation, we can follow these steps:

1. Multiply both sides of the equation by 100 to remove the fraction:

13 * (x + 7000) = 7000 * 100

2. Distribute the 13 on the left side of the equation:

13x + 13 * 7000 = 7000 * 100

3. Simplify the equation:

13x + 91000 = 700000

4. Subtract 91000 from both sides of the equation:

13x = 700000 - 91000

13x = 609000

5. Divide both sides of the equation by 13 to solve for x:

x = 609000 / 13

Now, let's calculate the value of x to find out the cost of the textbooks.

Using a calculator, we find that x ≈ 46846.15 rubles.

Therefore, the textbooks cost approximately 46846.15 rubles.

Answer:

The textbooks cost approximately 46846.15 rubles.