3/7*14/27=1/7*14/9=1/1*2/9=2/9
5/36*9=5/4*1=5/4=1 1/4=0,25
49/96*24/35=49/4*1/35=7/4*1/5=7/20
4 4/9*0,25=40/9*0,25=10/9=1 1/9 или
4 4/9*0,25=40/9*25/100=40/9*1/4=10/9*1/1=10/9=1 1/9
3 3/11*1 2/9=36/11*20/9=4/11*20/1=80/11=7 3/11
5/16*1 14/25*4/13=5/16*39/25*4/13=1/16*39/5*4/13=1/16*3/5*4/1=
=1/4*3/5*1/1=3/20
А)14, 21, 28, 35, 42 б) 12, 15, 18, 21, 24, 27, 30,33, 36, 39, 42 в) 18, 27, 36, г) 15, 20, 25, 30, 35 д) 11,13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41,43
1386/60=23,1(ч)
Ответ:23,1 ч.
-14+21х=56
21х=56+14
21х=70
х=10/3 или 3. 1/3