Ответы на вопрос:
(2 5/9-1 20/21): 1 8/49+1 8/9: 6=5/6 2 5/9-1 20/21=2 35/63-1 60/63=1-25/63=63/63-25/63=38/63 38/63: 1 8/49=38/63: 57/49=38/63*49/57=14/27 1 8/9: 6=17/9*1/6=17/54 14/27+17/54=28/54+17/54=45/54=5/6
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