Ответ:
а)2/7+1//7=3/7
3/7+4/7=7/7=1
1-3/5=5/5-3/5=2/5
2/5+1/5=3/5
б)3/11+6/11=9/11
9/11-9/11=0
0+5/6=5/6
5/6-2/6=3/6
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Ответ:
а)2/7+1//7=3/7
3/7+4/7=7/7=1
1-3/5=5/5-3/5=2/5
2/5+1/5=3/5
б)3/11+6/11=9/11
9/11-9/11=0
0+5/6=5/6
5/6-2/6=3/6