Ответы на вопрос:
(7/15 - 1/6) + 2/5 = (7*2/15*2 - 1*5/6*5) + 2*6/5*6 = (14/30 - 5/30) + 12/30 = = 9/30 + 12/30 = 21/30 = 7/10 = 0,7 (3/8 - 1/9) + 25/36 = (3*9/8*9 - 1*8/9*8) + 25*2/36/2 = (27/72 - 8/72) + 50/72 = = 19/72 + 50/72 = 69/72 = 23/ 24
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