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Ответ:

1)5-15/60-22/60=4 45/60-22/60=4 23/60

2)10-12/15-3/15=9

3)5-(9/22+2/22)=5-11/22=4 11/22= 4 1/2

4)8-(39/55-28/55)=8- 11/55=7 44/55=7 4/5

1) 1-(22/30+x)=7/30

22/30+x=1-7/30

22/30+x=23/30

x=23/30-22/30

x=1/30

2) (26/55+x)-23/55=32/55

26/55+x=32/55+23/55

26/55+x=1

x=1-26/55

x=29/55