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1/2 + 1/3 = (3 + 2)/6 ......................saco factor comun
= 5/6...................realizo la suma
1/2 - 1/3= (3 - 2)/6 ............................saco factor comun
= 1/6.........................realizo la resta
ojala te sirva :)
1/2 + 1/3 +1/5= 15+10+6/30= 31/30
1/2 - 1/3 -1/5 = 15 -10 -6/30= -1