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Вопрос по геометрии:
Площадь поверхности куба равна 98. Найдите его диагональ.-
Автор:
rory
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Ответ:
7
Объяснение:
S=a²·6=98⇒
a²=98÷6 (где S площадь поверхности куба, а - длина ребра)
d₁²=2a² (где d₁-диагональ основания)
Диагональ куба:
d₂=√(a²+d₁²)=√(a²+d₁²)=√(3a²)=√(3·98÷6)=√49=7
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Найти 15% от 620
Пожалуйста с объяснением-
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Может ли настоящая любовь быть бескорыстной.(Развернутый ответ) Пожалуйста!!!!!-
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Вопрос по английскому языку:
Выберете правильный вариант. СРОЧНО! ДАЮ 30 БАЛЛОВ
Choose the right variant:
1. The soldiers were very tired. They … an indomitable barrier.
a. had been erecting
b. had erected
c. have been erecting
2. The invaders … to ashes many cities before they … .
a. had burnt, stopped
b. has been burning, were stopped
c. had burnt, were stopped
3. We … part in the demonstration for 3 hours already.
a. have been taking
b. has taken
c. took
4. The city … very quickly since it … many years ago.
a. has developed, reappeared
b. developed, has been reappearing
c. has been developing, reappeared
5. Partisan Detachments … all the people by the end of the war.
a. had liberated
b. has liberated
c. liberated
6. My parents … at the Bryansk Arsenal since we … to Bryansk.
a. are working, have moved
b. have worked, had moved
c. have been working, moved
7. They … in the forest for 2 hours before they … to the Partisan Glade.
a. were wandering, had come
b. had been wandering, came
c. wandered, have come
8. He … to work at the Machine Building Plant after he … at the Bryansk Technological Academy for 5 years.
a. began, had been studying
b. has begun, studied
c. had been beginning, studied
9. Why are you late? – I … with my friends on the Pocrovskaya Hill for 2 hours.
a. have been walking
b. have walked
c. walked
10. The students … just the Bowl Mound.
a. have visited
b. had been visiting
c. visited-
Ответов: 1
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6 лет назад
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Почему развитие Северо-Восточной Руси имело большое значение в истории нашей страны? ( даю 100 баллов!!!)-
Ответов: 1
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