5/615=b1•q²/b1•q5=>1/125=1/q³=>q³=125
q=5
b1•5²=5
b1=5/25=1/5
ответ b1=1/5
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5/615=b1•q²/b1•q5=>1/125=1/q³=>q³=125
q=5
b1•5²=5
b1=5/25=1/5
ответ b1=1/5