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2) 1/3 + 2/4 = 4/12 + 6/12 = 10/ 12 -> 5/6
3) 2/3 + 1/2 = 4/6 + 3/6 = 7/6
4) 4/5 + 3/4 = 16/20 + 15/20 = 31/20
5) 2/3 + 3/2 = 4/6 + 9/6 = 13/6
6) 5/2 + 1/6 = 15/6 + 1/6 = 16/6
7) 8/5 + 1/2 = 16/10 + 5/10 = 21/10
8) 1/2 + 2 -> (cuando hay un número entero se considera como si el denominador fuera un 2)
1/2 + 4/2 = 5/2
9) 2/12 + 1/6 -> 2/12 + 2/12 = 4/12 -> 2/6 -> 1/3
10) 4/6 + 1/5 -> 20/30 + 6/30 = 26/30 -> 13/15
los siento pero no me acuerdo la resta