October 2018 1 13 Report
taller
1' se sabe que A=2/3 B=5/4 C=1/9 y D=4/5 prueba que
.a+b=b+a
. (a+b) + c= a +(b+c)
.a+b+c+d=(d+c)+(b+a)
. (a+d) -(b+c)=(b+c) =( b+c) + ( a+d)
.(a+d)-(b+c)=a+b-b-c
.a-b+c-d=(a-b)+(c-d)

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