№3
1) 7/9-11/27=21/27-11/27=10/27=27/10=2 7/10
2) 7 1/5:8 4/5=36/5:44/5=36/5*5/44=9/1*1/11=9/11=11/9=1 2/9
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№3
1) 7/9-11/27=21/27-11/27=10/27=27/10=2 7/10
2) 7 1/5:8 4/5=36/5:44/5=36/5*5/44=9/1*1/11=9/11=11/9=1 2/9