Correcto: 1/2 x 1/4 = 1/8, 1/3 + 1/3 = 2/3, 2/5 : 1/2 = 4/5, 6/5 - 4/5 = 2/5, 12/4 : 1/4 = 3/4, 3/4 - 1/4 = 2/4, 1/5 + 3/5 = 4/5, 2/3 x 1/4 = 2/12, Incorrecto: 1/2 x 2/3 = 2/5, 1/3 + 1/3 = 2/6, 2/6 : 1/2 = 1/3, 4/6 - 1/2 = 3/4, 1/5 : 1/2 = 5/2, 3/4 + 1/4 = 4/8, 5/4 - 1/2 = 4/2 , 1/4 x 1/4 = 1/8,

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