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Катя1Дирекшионер
первое верно, т.к. 1/20=5/20-4/20; 1/20=1/20
второе верно, т.к. 1/30=6/30-5/30;1/30=1/30
третье верно, т.к. 1/42=7/42-6/42; 1/42=1/42

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