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Casienne221
a fost răspuns

b1=3 b9=1/3^7 aflati ratia q . (progresia geometrica)

Răspuns :

Lucasela
b1=3
b9=b1xq^8=1/3^7
3xq^8=1/3^7=> q^8=1/3^8
q^8=(1/3)^8
q=1/3

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