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supervoron
supervoron
18.02.2020 07:41 •  Математика

Площа основи піраміди дорівнює 10 см2, а площа її повної поверхні – 30 см2. Знайдіть площу бічної поверхні піраміди.

👇
Ответ:
kirillovmatvey
kirillovmatvey
18.02.2020

10:2=5

30:2=15

15+5=20

Вiдповiдь:20см

4,6(84 оценок)
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Ответ:
ROMMIT2
ROMMIT2
18.02.2020

Пошаговое объяснение:

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4,4(68 оценок)
Ответ:
анна2255
анна2255
18.02.2020

Смотрите.

1) Обозначаем t — сколько времени они шли в первый день, тогда (t-1) — сколько во второй.

2) Теперь следующее соотношение — про 6 километров. Пускай в первый день они км, а во второй день — s2, тогда нам дано:

s1-s2=6.

3) Вспоминая, что расстояние=время*скорость (s=v*t), подставляем в эту формулу вместо s1 и s2:

(3,5*t)-(3*(t-1))=6.

Упрощаем:

3,5t-3t+3=6;

0,5t=3;

t=6.

ответ: Таким образом, в первый день они шли 6 часов. Во второй день — 6-1=5 (часов во второй день — 3*5 = 15 (км)

Пошаговое объяснение:

4,7(15 оценок)
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