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2 1/2 = 2*2 = 4 + 1 = 5
luego ponemos el mismo denominador osea 2 debajo del 5 y queda
5/2 - 11/2
se resuelve por.un método cruzado
2 * 5 - 2* 11 / 2* 2
= 10 - 22 / 4
= -12 /4
= -3