(5/14+10/21) * 3 3/5 + 11/6 : (13/22 *25/33)=7 31/325
1) 5/14+10/21= 15/42 + 20/42= 35/42= 5/6
2) 13/22 * 25/33 = 325/726
4) 5/6 * 3 3/5 = 5/6 * 18/5 =3/1=3
5) 11/6 : 325/726 =11/6 * 726/325 =
= (11*121)/(1*325)=1331/325= 4 31/325
6) 3+4 31/325 =7 31/325