Три слитка одинакового веса содержащих соответственно 15%,27% и 9% никеля сплавили в один слиток .найти процентной содержание никеля в получившемся слитке ?
At the moment I am а student of a comprehensive school #45. I like my school, but I think it could be better, so I would like to tell you about my ideal school.
My ideal school would be situated in a quiet place near a big park, so that students could walk there after classes to relax. There would be a big buffet, where students could have a cup of tea or coffee with a sandwich during the breaks. My ideal school would also have lockers for books and personal things like in American schools.
Nowadays we have to study a lot of subjects at school. But I think that the most important subjects are those, which will help us to pass the Unified State Exam and to enter the university. In my ideal school the majority of sciences would be given at fact-finding level and students of a high school would be allowed to choose subjects, which they would like to learn on a higher level, according to their aims and preferences. But of course, Russian will be a compulsory subject for everyone at my school, because we must admit that it is necessary for the literate writing. Information technology is another important subject, because computers simplify our lives and each of students will need to use it in future.
As well as the subjects of the curriculum, there would be many after-school clubs, such as chess, drama, music, arts and sports.
To sum up, I think my school would be a place I would like to go to!
А. Чтобы привести дробь к определенному знаменателю, необходимо вопользоваться основным свойством дроби. Выглядит оно так: а/в=ка/кв 4/9 = 8/18 = 12/27 = 48/108.
Б. Приведите к наименьшему обшему знаменателю дроби: Одна шестая, Пять двадцать четвёртых, одна двенадцатая, одинадцать тридцати. 1/6 5/24 1/12 11/30 Чтобы привести все эти дроби к общему знаменателю, нам надо определить этот общий знаменатель. Общим знаменателем обычно считают НОК. НОК(6,24,12,30)=120. 20/120 25/120 10/120 44/120.
Так как массы слитков одинаковы, то:
(15%+27%+9%)/3=17%
ответ: 17%