45:45/13-13,6+11/8=45*13/45-13,6+11/8=13-13,6+11/8=-0,6+11/8=-6/10+11/8=111/80-48/80=63/80=0.7875
4 и. 6остаток ....----------------
120, 360, 240.
120:4= 30, 120:5=24, 120:6=20
360:4=90, 360:5=72, 360:6=60
240:4=60, 240:5=48, 240:6=40
2 1/3 : Х = 3 1/2 : 1 1/5
7/3 : Х = 7/2 : 6/5
7/3 : Х = 35/12
Х = 7/3 : 35/12
Х = 4/5