rezolvati acest exercițiu va rogg repede dau oriceee
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(12/5 - 7/5 - 1/6) / (21/90 x 10/7 + 1/2)^2 =
= (5/5 - 1/6) / (3/9 + 1/2)^2 =
= 5/6 / (15/2)^2 =
= 5/6 / 225/4 = 5/6 x 4/225 = 2/135