Ответ:
1) 12/15=4/5; 14/21=2/3
2)9/14>4/5; 4/7<2/3
3) 1)4/7+2/5=20/35+14/35=34/35 2)7/12-5/9=21/36-20/36=1/36
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Ответ:
1) 12/15=4/5; 14/21=2/3
2)9/14>4/5; 4/7<2/3
3) 1)4/7+2/5=20/35+14/35=34/35 2)7/12-5/9=21/36-20/36=1/36