Три подружки, Единица, Двойка и Пятерка, приготовили для вас, ребята, задачу. Какой груз можно уравновесить при помощи чашечных весов и гирь весом в 1кг, 2 кг и 5 кг, если гири можно класть только на одну чашу весов? Какой груз можно уравновесить, если класть гири на обе чашки? Ответ объясните.

Дано: AM=AN

угол MNC=117град.

угол ABC=63 град.

Доказать : MNIIBC

Поставьте глаголы, данные в скобках, в нужную форму.

1. Peter and Ann (go) away five minutes ago. 2. I (write) the letter but I (not send) it. 3. He just (go) away. 4. She already (answer) the letter. 5. She (answer) it on Tuesday. 6.1 just (tell) you the answer. 7. I (read) that book in my summer holidays. 8.1 (not see) him for three yearsi I (be) glad to see him again some time. 11. What you (do)? — I (copy) the text from the textbook now. 12. He (go) to Moscow next week? 13. He (not smoke) for a month. He is trying to give it up. -14. When he (arrive)? — He (arrive) at 2,00. 15. You (switch off) the light before you left the house? 16. I (read) these books when I was at school. I (like) them very much. 17.1 can't go out because I (not finish) my work. 18.1 already(tell) you the answer yesterday. 19. What you (do) tomorrow in the morning? 20.i (not meet) him last week.21. I usually (leave) home at seven and (get) here at twelve. 22. Here is your watch. I just (find) it. 23. You (not have) your breakfast yet?