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1.4 7. 1 2/7+ 5 6/7:(2 2/5-3 4/7)*1,2. 3,7+(−1,2). −7+(−1,2). - 3 4/7+ 3 1/7*(4 1/10-(-4 5/10):(9/20)).
1 2/7+ 5 6/7:(2 2/5-3 4/7)*1,2. 3,7+(−1,2). −7+(−1,2). - 3 4/7+ 3 1/7*(4 1/10-(-4 5/10):(9/20)).

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