25a3=16a5 /:16a3
a5/a3=q²
a5/a3=25/16
q²=25/16
q=5/4 v q=-5/4
a4=a1*q³
a1=a4:q³
a1=5:(5/4)³= 64/25=2,56 v a1=-64/25=-2,56
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25a3=16a5 /:16a3
a5/a3=q²
a5/a3=25/16
q²=25/16
q=5/4 v q=-5/4
a4=a1*q³
a1=a4:q³
a1=5:(5/4)³= 64/25=2,56 v a1=-64/25=-2,56