b) 3:4.
Пошаговое объяснение:
Отношение 18 и 24 можно записать в виде:
- это значит 3 : 4.
To have a pet at home is a very good thing. And it is not important what pet you have. You may have a dog, a cat, a hamster, a parrot or a fish. The most popular pets are cats and dogs.
A cat is good for a small flat, and if you live in a big flat or a house you can keep a dog. It’s much simpler to have a cat because you don’t have to walk a cat every day.
Dogs are best friends of people. These animals are very clever and understand you very well. But you must remember that keeping a dog in a flat is not that easy. You need to walk it two or three times a day. So, you have to get up earlier in the morning and it also takes time to feed the dog. Dogs are hairy animals and they have a specific smell. Nevertheless, dogs are wonderful animals. I love dogs.
People usually keep hamsters, rats, mice and rabbits. These animals are rather easy to look after. These animals are funny, but all they do is eating.
Пошаговое объяснение:
1) Шаровой сегмент – это часть шара, ограниченная секущей плоскостью
2) Шаровой сектор — геометрическое тело, возникающее при вращении сектора вокруг одного из его радиусов или вокруг диаметра, не пересекающего его дуги
3) V конуса = ⅓πR²H
4) πR² * H = ⅓πH (4^2 + 4 * 22 + 22^2)
R =
= 14 см
5) V = 4/3πR^3
50 : 2 = 25 см радиус 1 шара, объём V1 = 4/3π25^3.
70 : 2 = 35 см радиус 2 шара, объём V2 = 4/3π35^3.
Найти сумму объёмов V1 + V2 = 4/3π25^3 + 4/3π35^3 = 4/3π (25^3 + 35^3) = 4/3π (15 625 + 42 875) = 4/3π * 58 500 = V3
R = (V3 : 4/3π)1/3 = 58 5001/3 = 38,8
D = 2R = 38,8 * 2 = 77,6 см
6) r = 1/2 * d = 1/2 * 4 = 4/2 = 2 м.
L = √(h2 + r2) = √(3,52 + 22) = √12,25 + 4 = √16,25 = 4,03 м - длина основания
S = π*R*L ; S = 3,14 * 2 * 4,03 = 6,28 * 4,0311 = 25,31 м^2
Сначала сократим дробь 18/24. Находим Наибольший Общий Делитель, 18 и 24 делятся на 6.
18:6=3 24:6= 4 . Получаем дробь 3/4.
Отношение 18/24= 3:4
ответ: b) 3:4