3/7 - 5/12 = 36/84 - 35/84 = 1/84
1/84 = 7 коп., значит 84/84 = 7*84=588 коп. = 5руб.88коп.
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3/7 - 5/12 = 36/84 - 35/84 = 1/84
1/84 = 7 коп., значит 84/84 = 7*84=588 коп. = 5руб.88коп.