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7 7/30-(5 11/30-у)=3 19/30
Даю 20 балов.
7 7/30-(5 11/30-у)=3 19/30
Даю 20 балов.
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7 7/30 - (5 11/30 - у) = 3 19/30
7 7/30 - 5 11/30 + у = 3 19/30
у = (3 19/30 + 5 11/30) - 7 7/30
у = 8 30/30 - 7 7/30
у = 1 целая 23/30
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Проверка:
7 7/30 - (5 11/30 - 1 23/30) = 3 19/30
7 7/30 - (4 41/30 - 1 23/30) = 3 19/30
6 37/30 - 3 18/30 = 3 19/30
3 19/30 = 3 19/30