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a2=3 a3=1 1/2
q=1 1/2/3
q=3/2/3 q=1/2
a2=a1*q
3=a1*1/2
a1=6
a4=3/2 *1/2
a4=3/4
a2=5 a4=45
a2=a1*q
a4=a1*q³
5=a1*q
45=a1*q³
a1=5/q
45=5/q *q³
45=5q² podzielimy przez5
9=q²
q=-3 lubq=3
a1=-5/3 luba1=5/3
a2=-5/3*(-3) lub a2=5/3*3
a2=5 lub a2=5