Вычислите : 1 ) 4 2/7 * 1 13/15 - 2 1/13 * 1 4/9 = 2) 2.4 * 1 5/12 * 17/17 - 3 1/7 = 3) 39 5/7 * 3 15/37 -2 5/7 * 3 15/37 = 4) 2 5/9 * 1 13/28 + 4 4/9 * 1 13/28 = 5) 25 18/47 - 12 30/41 + 8 29/41 =

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