22)
1 7/20 : 2,7 + 2,7 :1,35 + (0,4:2 1/2) * (4,2-1 3/40)
27/20 : 27/10 + 27/10 :135/100 + (4/10 :5/2) (42/10 - 43/40)
27*10/20*27 + 27*100/10*135 + (4*2/10*5) (168-43/40)
1/2 + 10/5 + 4/25 * 125/40
1/2 + 10/5 + 4*125/25*40
1/2+10/5+25/10
5+20+25/10
50/10 = 5