1)9/22 + 1 12/33 = 9/22 + 45/33=9/22+15/11 (9 * 1 + 15* 2)/22 = (9 + 30)/22 = 39/22 = 1 17/22
2) 1 17/22* 1,32=1 17/22 * 1 32/100 = 39/22 * 33/25 = 117/50 = 2 17/50
3) 8/13 * 0,1625= 8/13 * 1625/10000 = 8/13 * 13/80 = 1/10
4) 2 17/50-1/10=117/50 - 1/10 = (117 * 1 - 1 * 5)/50 = 117/50 - 5/50 = 112/50 = 56/25 = 2 6/25