1 3/5*2 4/7+2 4/7*1 1/10-1 1/7*1 4/7=
1 3/5*2 4/7=4 4/35 4 4/35+2 4/7=6 24/35 6 24/35*1 1/10=7 62/175 7 62/175-1 1/7=6 37/175 6 37/175*1 4/7=9 932/1225