Ответы на вопрос:
(12 5/13 + у ) - 9 9/13 = 7 7/13 12 5/13 + у - 9 9/13 = 7 7/13 у = 7 7/13 + 9 9/13 - 12 5/13 у= 4 11/13 проверим: ( 12 5/13 +4 11/13 ) - 9 9/13= 7 7/13 7 7/13 = 7 7/13
5+8 = 5 + (5+3) = (5 + 5)+3 = 10 + 3 = 13 5+(5+8) = 5+(5+8) = (5 + 5)+8 = 10 + 8 = 18 6+8 = 6+(4+4) = (6+4) +4 = 10 + 4 = 14 7+8 = 7+(3+5) = (7+ 3) +5 = 10 + 5 = 15
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