x - количество воробьев на первом кусте изначально,
y - количество воробьев на втором кусте изначально.
По условию
x+y = 25,
Количество воробьев на первом кусте после перераспределения:
x-5.
Количество воробьев на втором кусте после перераспределения:
y+5 - 7 = y - 2.
По условию:
y - 2 = 2·(x-5),
Решаем систему двух уравнений:
x+y = 25,
y - 2 = 2·(x-5).
y = 25 - x,
25 - x - 2 = 2·(x-5),
23 - x = 2x - 10,
23+10 = 2x + x,
3x = 33,
x = 33/3 = 11,
y = 25 - x = 25 - 11 = 14.
ответ. На первом кусте изначально было 11 воробьев, а на втором кусте изначально было 14.
1. This cup is dirty. These cups are dirty.
2. That biscuit was tasty. Those cups were tasty.
3. This hotel is very expensive but it's very nice. These hotels are very expensive but they are very nice.
4. There is a children's playground in the park. There are children's playgrounds.
5. That is a new supermarket in our town. Those are new supermarkets in our town.
6. It's a delicious lemon pie for dessert. There are delicious lemon pies for dessert.
7. It's a nice cotton dress for my niece. There are nice cotton dresses for my niece.
8. This man is an engineer. These men are engineers.
9. That woman is my sister. Those women are my sisters.
10. This child is my son. These children are my sons.
11. That goose is big. Those geese are big.
12. This mouse is white. These mice are white.
13. This man is a doctor. These men are doctors.
14. That woman is my cousin. Those women are my cousins. She is a teacher. They are teachers.
15. That girl is my niece. Those girls are my nieces
Объяснение: