3,6/х-1=2,8/6
3,6:х-1=7/15
3,6:х=1+7/15
3,6:х=22/15=1,46
х=3,6:1,46
х=180/73
б)х:6/7=1
7х/6=1
7х=6
х=6/7
1 1/6:3 1/2=7/6:7/2=7/6:21/6=7/21=1/3
3,6/х-1=2,8/6
3,6:х-1=7/15
3,6:х=1+7/15
3,6:х=22/15=1,46
х=3,6:1,46
х=180/73
б)х:6/7=1
7х/6=1
7х=6
х=6/7
1 1/6:3 1/2=7/6:7/2=7/6:21/6=7/21=1/3