ответить в тетради на во Смотреть пример.
Were you at the zoo on Saturday?
No, I wasn’t. I was at the shops.
1) Were you at school on Sunday?
2) Were you at the park on Monday?
3) Were you at the birthday party on Wednesday?
4) Were you at the theatre on Friday?
5) Were you at the hospital with your grandmother?
A: What were you doing when the robbery took place?
B: I was standing in the queue.
A: What happened next?
B: Two men were pushing their way to the front. One of them was holding a gun.
A: Then what the men were doing?
B: They ordered the cashier to give them the money.
A: How did police find out about the robbery?
B: Well, the cashier set off the alarm while the robbers were putting the money in a bag.
A: And what happened when the police arrived?
B: The man with the gun dropped it, but it wasn't a real gun after all; it was a plastic one.
Объяснение:
Пошаговое объяснение:
Обозначим красные воздушные шары - "К", зелёные - "З", синие - "С".
Пусть в коробке лежит х "К". ⇒ "З"=х/8 , а "С"≥1.
x+\frac{x}{8}+C=19.\ \ \ \ \ \ \ \ (1)x+
8
x
+C=19. (1)
Количество воздушных шаров - целое число. ⇒
\frac{x}{8}
8
x
- должно быть целым числом. Исходя из условия задачи х может равняться 8 и 16.
Подставляем х=8 в уравнение (1).
\begin{gathered}8+\frac{8}{8}+C=19\\8+1+C= 19\\9+C=19\\C=10.\end{gathered}
8+
8
8
+C=19
8+1+C=19
9+C=19
C=10.
Но по условию задачи "К">"C"≥1 ⇒ х≠8.
Подставляем х=16 в уравнение (1).
\begin{gathered}16+\frac{16}{8} +C=19\\16+2+C=19\\18+C=19\\C=1.\end{gathered}
16+
8
16
+C=19
16+2+C=19
18+C=19
C=1.
По условию задачи "К">"C"≥1 ⇒ x=16