Two girls-artist, Sue Jones, rent a room, under the window which is a huge tree. One of the girls was seriously ill, she desperately does not want to fight, come up with myself that as soon as the last autumn leaf fall from the tree outside the window, she dies, and is quietly waiting for death. A sheet of all falls, falls, falls ... It turns out the last leaf has fallen for a long time, as it should have happened, and the neighbor-artist, Berman old, not very talented, but very good, painted the exact same sheet in the picture , cold and died. His first and last masterpiece rescued the girl, because she suddenly went on the mend
Пошаговое объяснение:
Про Латунь и медь во вложениях и в комментариях к этому вопросу.
теперь про Бронзу и медь
2) Бронза содержит 80% меди. Сколько килограммов меди содержится в 54,5 кг бронзы? Решить задачу тремя
Первый
х=54,5кг бронзы×80%меди=43,6кг меди.
Второй
1кг бронзы = 80% меди
54,5кг=х
х=(54,5кг бронзы×80%меди)/1кг бронзы.
Бронзы сокращаются остаётся медь
54,5×80%меди=43,6кг меди.
третий
1кг бронзы =80% меди, значит 20% чистой бронзы.
54,5кг бронзы×20%чистой бронзы=10,9кг чистой бронзы.
54,5кг бронзы-10,9кг чистой бронзы =43,6кг
меди.