dauu coroanaa atentiee
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8/9 - 5/6 + 1/4 * [25/81 * 9] =
8/9 - 5/6 + 1/4 * 25/9 =
8/9 - 5/6 + 25/36 amplifici pe 8/9 cu 4 si pe 5/6 cu 6
28/36-30/36 +35/36 = 33/36 = 11/12