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2014-09-17T17:42:42+03:00
(3a+8b)/ (8a+15b) = 4/9 [ inmultim pe diagonala] => 9*(3a+8b)= 4*(8a+15b) => 27a+72b = 32a+60b => 72b-60b = 32a-27a => 12b=5a => a/b = 12/5
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