1)7/9-0,6=7/9-6/10=70/90-54/90=16/90=8/30=4/15
2)0,34+8/11= 34/100+8/11= 374/1100+800/1100=1174/1100=1 74/1100
3)7 5/36-4,55= 7 5/36-4 55/100= 7 125/900- 4 495/900=6 1025/900- 4 495/900 = 2 530/900. = 2 270/450 = 2 135/225 = 2 27/45 = 2 3/5.
4) 5,375- 1 3/19= 5 375/1000 - 1 3/19= 5 7125/19000 - 1 3000/19000 = 4 4125/19000= 4 825/3800