7/20*9+12*7/36+1,8/15: 4+3/5: 4 1/2

7/20*9+12*7/36+1,8/15:4+3/5:4 1/2=63/20+84/36+1,8/15*1/4+3/5:9/2=
=63/20+21/9+1,8/60+3/5*2/9=63/20+21/9+0,6/20+6/45=
=(63/20+0,6/20)+(21/9+6/45)=(630/200+6/200)+(105/45+6/45)=,
=636/200+111/45=159/50+111/45=1431/450+1110/450=2541/450=
=5 291/450=5 97/150