Ответ:
1) 5/2+13/2=18/2=9
2) 15/2-13/2=2/2=1
3) 13/7+1/7=14/7=2
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Ответ:
1) 5/2+13/2=18/2=9
2) 15/2-13/2=2/2=1
3) 13/7+1/7=14/7=2