Question

Решите с объяснением и пояснением.,но не уравнением.Чтобы купить 2 энциклопедии не хватает 137 рублей.А если купить одну,то останется 55 рублей. Сколько стоит одна энциклопедия?

Answer 1

137 Не хватает на 2,значит,1 энц. уже купили и осталось 55 и 137 не хватает-это и есть её цена...,   
137 +55 = 192 (руб) - стоит 1 энциклопедия
Ответ:192 рублей стоит 1 энциклопедия

Answer 2

Problem Analysis

To solve this problem, we need to determine the cost of one encyclopedia. We are given two scenarios: 1. If two encyclopedias are bought, there is a shortage of 137 rubles. 2. If only one encyclopedia is bought, there will be 55 rubles left.

Let's assume the cost of one encyclopedia is x rubles.

Solution

1. Scenario 1: If two encyclopedias are bought, there is a shortage of 137 rubles. - The cost of two encyclopedias would be 2x rubles. - According to the given information, there is a shortage of 137 rubles, so we can set up the equation: 2x - 137 = 0.

2. Scenario 2: If only one encyclopedia is bought, there will be 55 rubles left. - The cost of one encyclopedia would be x rubles. - According to the given information, there will be 55 rubles left, so we can set up the equation: x - 55 = 0.

To find the cost of one encyclopedia, we can solve either equation. Let's solve the second equation:

x - 55 = 0

Adding 55 to both sides:

x = 55

Therefore, the cost of one encyclopedia is 55 rubles.

Conclusion

The cost of one encyclopedia is 55 rubles.