номер 279
1) 9/10<10/9
2) 2/9<7/8
3) 5/7>3/7
номер 280
1)28/29–19/58=56/58–19/58=37/58
2)4/5–1/6=24/30–5/30=19/30
3)11/15–1/5=11/15–3/15=8/15
4)31/36–7/12=31/36–21/36=10/36=5/18
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номер 279
1) 9/10<10/9
2) 2/9<7/8
3) 5/7>3/7
номер 280
1)28/29–19/58=56/58–19/58=37/58
2)4/5–1/6=24/30–5/30=19/30
3)11/15–1/5=11/15–3/15=8/15
4)31/36–7/12=31/36–21/36=10/36=5/18