Ответ:
1)(5/21+2/21)+2/15-7/21+2/15=1/3+2/15=5/1 5+2/15-7/15
2)(3/28+1/28)+2/35=4/28+2/35=1/7+2/35=
5/35+2/35-7/35=1/5
3)(7/30+1/30)+(8/45+2/45)=8/30+10/45=4/
15+10/45-12/45+10/45-22/45 3/12+24/60-15/60+24/60=39/60=13/20
4)(5/24+1/24)+(11/60+13/60)=6/24+24/60=
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Ответ:
1)(5/21+2/21)+2/15-7/21+2/15=1/3+2/15=5/1 5+2/15-7/15
2)(3/28+1/28)+2/35=4/28+2/35=1/7+2/35=
5/35+2/35-7/35=1/5
3)(7/30+1/30)+(8/45+2/45)=8/30+10/45=4/
15+10/45-12/45+10/45-22/45 3/12+24/60-15/60+24/60=39/60=13/20
4)(5/24+1/24)+(11/60+13/60)=6/24+24/60=