Отношение а и б равно 2 2/3 найдите отношение а + б/б

 

 

 

 

In the room where mr small. dr foam and mrs bulmer were talking to the children, there were some really old people. mr small went up to one of them.  he said he saw that he was a very old man.the old man replied he was 90.mr small  asked if the old man  could   give  the children there some advice about a balanced diet and a healthy lifestyle.the old man  said to follow his example. not to smoke,not to drink, not to eat  too much sugar or fat and drink lots of water.at that moment dr foam found another old man who looked older than the first one. he was sitting in a wheelchair, but his eyes were merry and bright.  dr foam asked how old he was.the man replied that he was  ninety-five.doctor foam  asked if the old man could tell them why he had lived so long.he answered that it was easy. he did  dexercises, and he didn't smoke or drink.   he spent a lot of time in the open air and he was a vegetarian.  just then mrs bulmer decided to join in the conversation. she saw a very, very old man in the corner of the room. he had no teeth or hair and he couldn't see or hear very well, so she had to come very close to him. the children followed her.   she shouted if she might ask him a couple of questions.    the old man whispered that she could.mrs bulmer asked why he had lived so long.the man replied that he didn't know.  mrs bulmer continued and  asked him to  tell them  about his lifestyle .he answered that he smoked thirty cigarettes a day and drank a  bottle of whisky every day. he also  had two bottles  of beer. he never  ate vegetables or fruit and he lived  on chocolate and cakes.mr bulmer  exclaimed  how old he was.the "old"  man replied that he was forty.

А) сумма двух простых чисел быть простым числом; да, например 11+2=13. 11 и 2 - простые числа. 13-простое число. составным числом? да. 13+2=15. 13 и 2 простые, а 15 составное, т.к. у него делителей больше двух: 1; 3; 5; 15.   б) произведение двух простых чисел быть простым числом. нет. т.к.  у произведения будет минимум три делителя:   1; первое число и второе число. значит произведение не яв. простым числом.;   составным числом? да. 5*3=15. делителей 5 штук: 1; 3; 5; 15; 45.