michaeldouglas963696 29/10/2013 A1=0.15razão=0.15-0.40=0,25An=a1+(n-1).ran20=0,15+(20-1).0.25a20=0,15+19.0,25a20=0,15+4,75a20=4,9s20=(a1+a20).n/2s20=(0,15+4,9).20/2s20=5,05.20/2s20=101/2s20=50,5
michaeldouglas963696
A1=0.15
razão=0.15-0.40=0,25
An=a1+(n-1).r
an20=0,15+(20-1).0.25
a20=0,15+19.0,25
a20=0,15+4,75
a20=4,9
s20=(a1+a20).n/2
s20=(0,15+4,9).20/2
s20=5,05.20/2
s20=101/2
s20=50,5