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Найдите значение выражения
(7-а)(7+а)-а(25-а) при а=-21/25(это дробь если что)​

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khalitovroman
khalitovroman
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ответ:

1. the astronauts travel through airless space.

2.   life is not easy on the international space station

3. lack of gravity means things can float around in the spacecraft

4. astronauts have to strap their sleeping bags to the wall.

5. zero gravity makes muscles go soft.

6. the astronauts keep themselves clean with a vacuum hose.

7.their muscles go soft in space, so they have to exercise regularly

8. even on iss, they still have to do household chores

9. the station is the size of a football pitch

10. astronauts spend a lot of time doing experiments.

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