Решите . в 4"а" классе учится 28 учеников , а в 4"б" 24 ученика , а в 4"в" 20 учеников. можно ли перевести часть учеников из класса так, чтобы во всех классах учеников станет в каждом классе? подумайте над вопросами: как уравнять число учеников в классах переведя из класса в класс наименьшее количество детей? можно ли уравнять количество учеников в классах , если в 4"б" будет 26 учеников?

Переводим 4 ученика из А класса в В, получаеться равное количество ученников в каждом классе. Испульзуем наименьший диференциал, переводя по 1 ученику из классов А и В, в Б, то получаем в Б классе 26, а в А и В по 23 ученика, следуя вопросу мы перевели наименьшее количество учеников уравнивая число ученников в классах.

Exersice 5

They have lived in that flat for five years.

We have been in this lesson since three o'clock.

I've like fishing for nine months.

exercise 6

2.I've been in this class since 8AM

3.We have been best friends since college .

4. I've been studying in this school for 5 years.

5. I've lived in my house for twelve years .

6. I have been learning English since 2012.

exercise 7.

2. How long have you been in this class?

3. When have you met your best friend?

4.How many years have you studied in this school?

5. How many years have you lived in your house ?

6. Where have you studied English?

Exersice 5

They have lived in that flat for five years.

We have been in this lesson since three o'clock.

I've like fishing for nine months.

exercise 6

2.I've been in this class since 8AM

3.We have been best friends since college .

4. I've been studying in this school for 5 years.

5. I've lived in my house for twelve years .

6. I have been learning English since 2012.

exercise 7.

2. How long have you been in this class?

3. When have you met your best friend?

4.How many years have you studied in this school?

5. How many years have you lived in your house ?

6. Where have you studied English?