(3*60*60+45*60)\ (7*60+30)=62
(16000+900)\50=338
(5*10*10+25)см. кв \ 25см =21см
20:2=10 км 1/7 маршрута
10*7=70 км
1-------15км, 2-----15+5км, 3------15+10, 4--------15+15, 5)15+20..
Длина маршрута?
15+20+25++30+35=125
Ответ:125км
А) 3/16 + 5/8 = 3/16 + 10/16 = 13/16
Б) 11/16 + 3/8 = 11/16 + 6/16 = 17/16 = 1 ( 1/16 )
В) 11/18 + 1/6 = 11/18 + 3/18 = 14/18 = 7/9
Г) 1/18 + 5/6 = 1/18 + 15/18 = 16/18 = 8/9
4/5 * 3/7 = 12/35
3 * 2/5 = 6/5 = 1 1/5
5/9 * 3 2/5 = 5/9 * 17/5 = 17/9 = 1 8/9
5/9 * 3/10 = 1/6
3/8 * 1 5/9 = 3/8 * 14/9 = 14/24 = 7/12