10ч44мин48с:48=(10*3600с+44*60с+48с):48=(36000с+2640с+48с):48=
=38688с:48=806с
1)
3 1/8:3 3/4=х:0,6
3 3/4 х=3 1/8*0,6
15/4 х=25/8*6/10
15/4 х=15/8
х=15/8:15/4
х=1/2
2)
(3*х-1):0,2=1/5
3х-1=1/5*0,2
3х-1=1/5*2/10
3х-1=1/25
3х=1/25+1
3х=1 1/25
3х=26/25
х=26/25:3
х=26/75