Вопрос школьника по предмету Алгебра
из двух городов расстояние между которыми 52км одночасто отправились навстречу друг другу два велосипедиста и встретились через 2 год.Знайдить скорость каждого велосипедиста если известно, что второй проезжает за 3 часа на 18 км больше чем первый за 2 часа
Ответ учителя по предмету Алгебра
X- скорость первого
у — скорость второго, тогла
2х +2у = 52
2х+18=3у
х= (52-2у)/2
2 * (52-2у)/2+18=3у
-2у-3у=-18-52
-5у= -70
у = 14 (км/ч) — скорость второго
х=(52-14*2) /2 = 24 / 2 = 12 км/ч — скорость первого
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ющейся форме, так чтобы получить Present Continuous
или Present Perfect.
1. What are you (to do) here? — I am (to write) a letter to
my friends. 2. Who has (to write) this article? 3. What
language are you (to study)? 4. We have already (to learn) a
lot of English words. 5. What is she (to teach) them? 6. Who
has (to teach) you to do it? 7. He has just (to do) something
for us. 8. Have you (to find) the book? 9. What are you
(to look) for? 10. What are you (to talk) about? 11. We have
just (to talk) about it. 12. He has just (to say) something
about it. 13. She is (to tell) them some interesting story. 14.
He has (to tell) us nothing about it. 15. She has (to tell) them
some stories about dogs. 16. We have (to have) two lessons
today. 17. They are (to have) a meeting. 18. She has not (to
speak) yet. 19. They have (to ask) me several questions. 20.
He has already (to learn) the rule. 21. I am (to write) an
exercise. 22. What is he (to do)? — He is (to read) a
newspaper. 23. Have you (to read) any stories by Jack
London? 24. I am (to answer) the telephone right now. 25.
He has (to fix) his car and now he is (not to have) any
trouble with the brakes anymore. 26. You have just (to hear)
tomorrow’s weather forecast.