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Leo tolstoy was born on 9 sentyabrya year. "young loew has been in musclemania four years. in july 1837 suddenly his father died. (mother tolstoy died when he was two years old.) orphaned children moved to kazan, where she was their guardian, aunt p. i. yushkova. tolstoy lived in kazan six years. that was the time of his adolescence and youth. two and a half years he was preparing to enter the university. deciding to become a diplomat, tolstoy sat exams on the east branch. he successfully passed the exams on the history, geography, mathematics, statistics, russian literature, logic, english, french, german, latin, arabic, turkish and tatar languages. already in the time of leo tolstoy showed exceptional ability to learn foreign languages. later, the sister of the writer was talking about. professor hired as a senior teacher with whom tolstoy studied turkish and tatar languages, found his ability to master languages extraordinary."

1. Чтобы найти часть, нужно умножить этот процент и разделить на 100%
380*45=17100
17100:100 = (при делении на 10,100 и т.д. нужно в лево убрать за запятую столько знаком, сколько нулей) 171.
ответ: 171т.
2. (299,3:14,6 – 9,62)∙3,5+72,2
299,3:14,6=20,5
20,5-9,62= 20,50 - 9,62 = 10,88
10,88∙3,5 = 38,08
38,08+72,2= 38,08+72,20 = 110,28
ответ: 110,28.
3.Чтобы найти все число, нужно умножить на 100% и разделить на процент.
1170*100 = (при умножении мы переносим запятую вправо) 117000
117000:18 = 6500
ответ: 6500га.
4. 6,7у+13+3,1у=86,5 
Приводим подобные.
9,8у+13=86,5
При переносе меняем знак у числа.
9,8у=86,5-13
9,8у=73,5
у=73,5:(9,8)
у=7,5
5. 40+30=70% в общем
105*100:70=150.
ответ:150р