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1/3-1/2-1/1+3/4-3/5
Buscas el mcm en este caso es 60
20-90+45-36/60 = -61/60 = 1 entero 1/60
b) 1-(- 5/4 +2) -(-7/12)
1-(-2 5/4) +7/12
1-(-13/4)+7/12
1/1+13/4+7/12= 58/12 = 29/6 = 4 5/6