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-45/35 + 45/36
Descomponiendo 35
35/5 = 7
35 = 5*7
Descomponiendo 36
36/2 = 18
18/2 = 9
9/9 = 3
3/3 = 1
36 = 2^2 * 3^2
MCM: (35)(36) = 1260
-45/35 + 45/36 = (-45)(36)+(45)(35)/1260
= ((-1620)+(1575))/1260
= -45/1260
= -1/28
Respuesta: -1/28