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Ответ:

7/8-1/4+5/12=63-18+30/72=1 1/24

5/9-1/3+1/6=10-6+3/18=7/18

13/18-1/4+4/9=26-9+16/36=11/12

3/4-5/12+1/5=45-25+12/60=8/15

7/10-2/15+1/6=21-4+5/30=11/15

17/18-5/12+2/9=34-15+8/36=3/4

(2/5-3/20)+3/25=2/5-3/20=1/4+3/25=37/100