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скількома нулями закінчується добуток усіх натуральних чисел від 18 до 45 включно?
Допоможіть будьласка з розвязанням.
Заздалегіть вдячна.-
Предмет:
Математика -
Автор:
braun - 5 лет назад
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Ответы 1
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18,19-не дают нули20-29 дают два нуля (от 20 и от 25*22), также с 30-39 и с 40-452*3=6 нулей
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Автор:
jerrymorton - 5 лет назад
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0
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МНОГО БАЛОВ !!
Раздел 2 (задания по чтению)
Прочитайте тексты и установите соответствие между текстами и их
заголовками: к каждому тексту, обозначенному буквами А–G, подберите
соответствующий заголовок, обозначенный цифрами. Используйте каждую
цифру только один раз. В задании есть один лишний заголовок.
1. The scientific explanation 5. Places without rainbows
2. The real shape 6. A personal vision
3. A lucky sign 7. A bridge between worlds
4. Some tips 8. Impossible to catch
A. Two people never see the same rainbow. Each person sees a different one. It
happens because the raindrops are constantly moving so the rainbow is always
changing too. Each time you see a rainbow it is unique and it will never be the
same! In addition, everyone sees colours differently according to the light and
how their eyes interpret it.
B. A rainbow is an optical phenomenon that is seen in the atmosphere. It appears
in the sky when the sun’s light is reflected by the raindrops. A rainbow always
appears during or immediately after showers when the sun is shining and the
air contains raindrops. As a result, a spectrum of colours is seen in the sky. It
takes the shape of a multicoloured arc.
C. Many cultures see the rainbow as a road, a connection between earth and
heaven (the place where God lives). Legends say that it goes below the earth at
the horizon and then comes back up again. In this way it makes a permanent
link between what is above and below, between life and death. In some myths
the rainbow is compared to a staircase connecting earth to heaven.
D. We all believe that the rainbow is arch-shaped. The funny thing is that it's
actually a circle. The reason we don’t see the other half of the rainbow is
because we cannot see below the horizon. However, the higher we are above
the ground, the more of the rainbow’s circle we can see. That is why, from an
airplane in flight, a rainbow will appear as a complete circle with the shadow of
the airplane in the centre.
E. In many cultures there is a belief that seeing a rainbow is good. Legends say
that if you dig at the end of a rainbow, you'll find a pot of gold. Rainbows are
also seen after a storm, showing that the weather is getting better, and there is
hope after the storm. This is why they are associated with rescue and good
fortune. If people happen to get married on such a day, it is said that they will
enjoy a very happy life together.
F. You can never reach the end of a rainbow. A rainbow is all light and water. It is
always in front of you while your back is to the sun. As you move, the rainbow
that your eye sees moves as well and it will always ‘move away’ at the same
speed that you are moving. No matter how hard you try, a rainbow will always
be as far away from you as it was before you started to move towards it.
G. To see a rainbow you have to remember some points. First, you should be
standing with the sun behind you. Secondly, the rain should be in front of you.
The most impressive rainbows appear when half of the sky is still dark with
clouds and the other half is clear. The best time to see a rainbow is on a warm
day in the early morning after sunrise or late afternoon before sunset. Rainbows
are often seen near waterfalls and fountains.
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