1) (3 7/25+2,72)*5/24=(3,28+2,72)*5=6*5=30
2) 15/16:3 3/4-2/9=15/16:15/4-2/9=(15*4)/(16*15)-2/9=4/16-2/9=1/4-2/9=9/36-8/36=1/36
3) (0,36+0,224/0,35)*5=(0,36+0,64)*5=1*5=5
4) (5,85:1 19/20-2 5/9):4=(5,85:1,95-2 5/9):4=(3-2 5/9):4=4/9:4=4/(9*4)=1/9
30/(1/36)-5/(1/9)=30/1:1/36-5/1:1/9=(30*36)/(1*1)-(5*9)/(1*1)=1080-45=1035