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b) 1/5 - 2/18 = 1/5 - 1/9 = (1/5)(9/9) - (1/9)(5/5) = 9/45 - 5/45 = 4/45
c) 2 + 1/5 = (2)(5/5) + 1/5 = 10/5 + 1/5 = 11/15
eso es todo, saludos!