5.
.......................................=26963 8/9
1) 18 21/53 * 42 2/5=975/53 * 212/5=195*4=780
2) 27/34 * 47 2/9=27/34 * 425/9=(3*25)/2=75/2=37 1/2
3) 780 * 75/2=390*75=29250
4) 8 216/617 * 15 17/40=5152/617 * 617/40=5152/40=644/5
5) 125/161 * 644/5=25*4=100
6) 100*22 31/36=100 * 823/36=(25*823)/9=20575/9=2286 1/9
7) 29250 - 2286 1/9=26963 8/9
6.
..............................=2
1) 4 23/63 * 8 37/55=275/63 * 477/55=(5*53)/7=265/7=37 6/7
2) 16 1/5 : 21/25=81/5 * 25/21=(27*5)/7=135/7=19 2/7
3) 37 6/7 - 19 2/7=18 4/7130/7
4) 130/7:26/77=130/7 * 77/26=5*11=55
5) 14 8/11 * 55=162/11 * 55=162*5=810
6) 810 *1/405=2