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