Ответ:
3/5+7/15-1/3=18/30+14/30-10/30=22/30=11/15 ; 1/2+2/3=3/6+4/6=7/6= 1целая1/6 ; 12/13-1/2= 24/26-13/26= 11/26 ; 5/7+1/11=55/77+7/77=62/77 ; 4/9+1/18= 8/18+1/18=9/18=1/2.
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Ответ:
3/5+7/15-1/3=18/30+14/30-10/30=22/30=11/15 ; 1/2+2/3=3/6+4/6=7/6= 1целая1/6 ; 12/13-1/2= 24/26-13/26= 11/26 ; 5/7+1/11=55/77+7/77=62/77 ; 4/9+1/18= 8/18+1/18=9/18=1/2.