Question

арман купил 3 книги цена 2 и 3 книги вместе 1800 тенге первый и второй вместе 1300 тенге 1 и 3 1500 тенге сколько стоит каждая книга

Answer 1

Пусть первая книга=а, вторая=в, третья=с
в+с=1800    в=1800-с
а+в=1300    а=1300-в
а+с=1500    а=1500-с

1300-в=1500-с
1300-1800+с=1500-с
с+с=1500+1800-1300
2с=2000
с=1000  третья книга стоит 1000, вторая 800, первая 500

Answer 2

Let's assume the prices of the three books are represented by variables: x, y, and z.

Based on the given information, we can set up the following system of equations:

1. "Арман купил 3 книги цена": x + y + z = 1800
2. "2 и 3 книги вместе 1800 тенге": y + z = 1800
3. "Первый и второй вместе 1300 тенге": x + y = 1300
4. "1 и 3 книги 1500 тенге": x + z = 1500

Now, we can solve this system of equations to find the values of x, y, and z.

Let's start with equation (2): y + z = 1800 Since we already know from equation (1) that x + y + z = 1800, we can subtract equation (2) from equation (1) to find the value of x: (x + y + z) - (y + z) = 1800 - 1800 x = 0

Now we know that x = 0. Let's substitute this value into equation (3): 0 + y = 1300 y = 1300

Next, let's substitute the values of x and y into equation (1) to find z: 0 + 1300 + z = 1800 z = 1800 - 1300 z = 500

So, the values of x, y, and z are: x = 0 y = 1300 z = 500

Now we have found the prices of the three books:

The first book costs 0 tеnge. The second book costs 1300 tеnge. The third book costs 500 tеnge.