Ответы на вопрос:
А) (7/15 + 7/30 + 4/5) : (2 - 1/3 - 1/2) = 1 2/7 1) 7/15 + 7/30 = 14/30 + 7/30 = 21/30 = 7/10 2) 7/10 + 4/5 = 7/10 + 8/10 = 15/10 = 1 5/10 = 1 1/2 3) 2 - 1/3 = 1 3/3 - 1/3 = 1 2/3 4) 1 2/3 - 1/2 = 1 4/6 - 3/6 = 1 1/6 5) 1 1/2 : 1 1/6 = 3/2 : 7/6 = 3/2 * 6/7 = 18/14 = 1 4/14 = 1 2/7 б) (1/6 + 1/10 + 1/15) : (3/5 - 1/3 - 1/4) = 20 1) 1/6 + 1/10 = 5/30 + 3/30 = 8/30 = 4/15 2) 4/15 + 1/15 = 5/15 = 1/3 3) 3/5 - 1/3 = 9/15 - 5/15 = 4/15 4) 4/15 - 1/4 = 16/60 - 15/60 = 1/60 5) 1/3 : 1/60 = 1/3 * 60/1 = 60/3 = 20
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