September 2018 2 66 Report
Responde con verdadero o falso cada enunciado.
A. a-b=a+(-b)=(-b)+a
B. a+b+c=(a+b)+c=c+b+a
C. a+1=1+a=a
D. a+0=0+a=0
E. a+(-a)=(-a)+a=0
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