Предмет: Математика, автор: djk36161

7. Поезд прошел за первый час пути, а за второй - остатка, а за третий час он прошел на 25 км больше, чем за первый час. Какое расстояние прошел поезд за три часа?


djk36161: 1 час - 1/2 пути
2 час - 1/2 остатка
daibabahubum: ну получается так...
daibabahubum: сам только понял)

Ответы

Автор ответа: daibabahubum
0

Ответ:Весь путь = 1 или 72/72


Пошаговое объяснение:

7/24 + 5/18 (домножаем дроби для того чтобы найти общий знаменатель: 7/24 на 3, 5/18 на 4) = 21/72 + 20/72 = 41/72

72/72-41/72=31/72 (третий час)


djk36161: почему 72/72?
djk36161: 7/24... откуда7
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Read these sentences and choose the correct answer to fill in the gaps.



1. They haven't eaten for hours – they __________ be starving.

must
can
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must
can
3. My sister is 5 years old but she __________ read.

must
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had to
must
6. She earns decent money. She __________ buy everything.

can
is able to
7. Will he __________ continue his journey?

can
be able to
8. I'm locked in! I __________ get out!

am not able to
can't
9. I __________ speak Spanish, but maybe I'll learn it someday.

couldn't
can't
10. In 1800, nobody __________ travel into space.

could
couldn't
11. If you worked harder, you __________ pass your exams.

can
could
12. Mary __________ play the piano wonderfully. She loves music.

can
has to
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am able to
have to
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could
can
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has to
have to
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must
can
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will be able to
won’t be able to
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don't have to
doesn't have to
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don’t have to
doesn’t have to
20. Mum __________ make sandwiches.

can
have to
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