calcula y simplifica
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3/4 + 1/4 = 4/4 = 1 entero
3/8 + 1/8 = 4/8 = 2/4 = 1/2
1/9 + 2/9 = 3/9 = 1/3
6/9 - 3/9 = 3/9 = 1/3
8/10 - 3/10 = 5/10 = 1/2
8/12 - 4/12 =4/12 = 1/3
3/8 + 1/8 = 4/8 = 2/4 = 1/2
1/9 + 2/9 = 3/9 = 1/3
6/9 - 3/9 = 3/9 = 1/3
8/10 - 3/10 = 5/10 = 1/2
8/12 - 4/12 =4/12 = 1/3
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