Ответы на вопрос:
4- (2/5 + 7/18) = 3 19/90 1) 2/5 + 7/18 = 36/90 + 35/90 = 71/90 2) 4 - 71/90 = 3 19/90 2 - (11/19 + 15/38) = 1 1/38 1) 11/19 + 15/38 = 22/38 + 15/38 = 37/38 2) 2 - 37/38 = 1 1/38 5 - (2/5 + 5/14) = 4 17/70 1) 2/5 + 5/14 = 28/70 + 25/70 = 53/70 2) 5 - 53/70 = 4 17/70 7 - (19/40 + 1/3) = 6 23/120 1) 19/40 + 1/3 = 57/120 + 40/120 = 97/120 2) 7 - 97/120 = 6 23/120
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