Тема "алкины" а) ch3 - c = c - ch2 | | | ch3 ch3 ch3 б) ch2= c - ch2 | | h3c ch2-ch3 в) ch3-c=ch | | h3c ch -ch2 - ch3 | ch3

ник3096    3   21.05.2019 20:18    0