escribir el numero que falta de acuerdo a la propiedad que ilustra para completar la igualdad 13.______ = -15. ______
13+1= -15+29
14=14
facil no??
13 .1/13= -15 . -1/15
1=1
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13+1= -15+29
14=14
facil no??
13 .1/13= -15 . -1/15
1=1