valor de (1/2.9/7) : (2/4-1/6) + 1/2+5/2.2/5
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(1/2 . 9/7) : (2/4 - 1/6) + 1/2 + 5/2 . 2/5
9/14 : (2/4 - 1/6) + 1/2 + 1
9/14 : (12 - 4)/24 + 1/2 + 1
9/14 : 8/24 + 1/2 + 1
9/14 : 1/3 + 1/2 + 1
9/14 . 3 + 1/2 + 1
27/14 + 1/2 + 1
(54 + 14)/28 + 1
68/28 + 1
17/7 + 7/7
24/7
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