геометрическая прогрессия в1+в5=? q=3 S6=1820
S=(b1*(q^n-1))/(q-1)
1820=(b1*(729-1))/(3-1),
b1=5
b5=b1*q^4=5*81=405
b1+b5=410
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S=(b1*(q^n-1))/(q-1)
1820=(b1*(729-1))/(3-1),
b1=5
b5=b1*q^4=5*81=405
b1+b5=410