Ответы и объяснения

2013-10-06T09:50:50+00:00
Х+8/15=1 3/4
60х/60+32/60=105/60
60х/60=105/60-32/60
60х/60=73/60
х=1 13/60

1 1/8 -х =13/16
18/16 - х =13/16
18/16-13/16=х
х=5/16

х-7 1/2 =3 3/4
х- 7 2/4 = 3 3/4
х=3 3/4 + 7 2/4
х= 11 1/4

2,8-х=3/4
2 8/10 - х = 3/4
2 4/5 - х =3/4
14/5 - х =3/4
56/20 - х = 15/20
56/20-15/20=х
х=41/20
х=2 1/20