07)
6. Найди значения выражений. Назови числа в порядке возрас
тания,
и ты узнаешь, какие источники загрязнения самые активные.
“ся
а-
Источники загрязнения
дь-
Неочищенные
промышленные стоки
Неочищенные стоки
сельскохозяйственного
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| 579 + 298
973 — 646
Коммунальное
хозяйство
Транспорт
108 - 2
203 - 2
Назови, какому цвету на диаграмме
соответствует каждый источник за-
грязнения.
не-
Л.​

My hobby is drawing

Hobbies make our life more colouful and they keep us occupied in our leisure time. And I believe hobbies help us both to relax and to develop.

My favourite hobby is drawing. I started drawing when I was five. My mother was a great teacher in my childhood, she always encouraged me and praised my funny drawings. She even decorated the house with them. And the best presents on my parents’ and grandparents’ birthdays were also my drawings. Of course I was pleased and quite proud of my works. Since then this hobby has become a very important part of my life.

I studied drawing from the special literature containing different sketches. I learnt to imitate drawing nature, beautiful buildings, human faces and bodies, animals and birds. I practiced in making them realistic and natural. My hobby made me observe the world around me every minute of my life. I realized that observation was the main thing in the art of painting and drawing.

Today drawing and painting are so much fun to me. I just need a paint brush and watercolour, crayons or pencils and some drawing paper. And I feel happy and never get bored with my hobby. I try to show all my devotion, imagination and creativity in my works. Mostly I am fond of still-lives and landscapes in light colours. Although it happens sometimes that I suddenly take a pen and start drawing whatever comes to my mind. I don’t consider myself to be a great artist and I still have much to be improved but my friends are always amazed at my pictures and they find them unique.

Drawing brings me real satisfaction. It is my own little world. And I hope one day it will help me to focus on my goal and become a graphic designer.

Примеры:
а) найти НОД (6600; 6300):
6600 = 2 • 2 • 2 • 3 • 5 • 5 • 11,
6300 = 2 • 2 • 3 • 3 • 5 • 5 • 7,
НОД (6600; 6300) = 2 • 2 • 3 • 5 • 5 = 300;
б) найти НОД (34 398; 1260; 6552):
34 398 - 2 • 3 • 3 • 3 • 7 • 7 • 13,
1260 = 2 • 2 • 3 • 3 • 5 • 7,
6562 = 2 • 2 • 2 • 3 • 3 • 7 • 13,
НОД (34 398; 1260; 6652) = 2 • 3 • 3 • 7 = 126.
При нахождении наибольшего общего делителя двух чисел полезно знать еще одно правило, называемое «алгоритмом Евклида» .
Пример. Найти НОД (270; 186). Разделим 270 на 186 с остатком:
270 : 186 = 1 (ост. 84). Далее разделим делитель на остаток и т. д. : 186 : 84 = 2 (ост. 18), 84 : 18 = 4 (ост. 12), 18 : 12 = 1 (ост. 6), 12 : 6 = 2 (ост. 0).
Наибольшим общим делителем чисел 270 и 186 является последний ненулевой остаток, т. е. число 6.
Пример. Найти НОД (234; 180).
1)234 : 180 = 1 (ост. 54),
2)180: 54 = 3 (ост. 18),
3)54 : 18 = 3 (ост. 0). Следовательно, НОД (234; 180) = 18.
Натуральные числа называют взаимно простыми, если их наибольший общий делитель равен единице.
Примеры:
а) 75 и 14 — взаимно простые числа, так как НОД (75; 14)= 1;
б) 20, 9 и 77 взаимно простые числа, так как НОД (20; 9; 77) =