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-1,_,_,_,_,_,_5/2 PA TEM 8 TERMOS
an=a1+(n-1.r
5/2=-1+(8-1).r a1=-1
5/2=-1+7r a2=-1+1/2=-2/2+1/2=-1/2
-1+7r=5/2 a3=-1/2+1/2=0
7r=5/2+1 a4=0+1/2=1/2
7r=5/2+2/2 a5=1/2+1/2=2/2=1
a6=1+1/2=2/2+1/2=3/2
7r=7/2 a7=3/2+1/2=4/2=2
r=7/2:7 a8=2+1/2=4/2+1/2=5/2
r=7/2 x 1/7
r=7/14( simplificando por 7)
r=1/2
an=a1+(n-1.r
5/2=-1+(8-1).r a1=-1
5/2=-1+7r a2=-1+1/2=-2/2+1/2=-1/2
-1+7r=5/2 a3=-1/2+1/2=0
7r=5/2+1 a4=0+1/2=1/2
7r=5/2+2/2 a5=1/2+1/2=2/2=1
a6=1+1/2=2/2+1/2=3/2
7r=7/2 a7=3/2+1/2=4/2=2
r=7/2:7 a8=2+1/2=4/2+1/2=5/2
r=7/2 x 1/7
r=7/14( simplificando por 7)
r=1/2
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