Ответ:
Sn=[tex]\frac{b1*(q^{n}-1) }{q-1}[/tex]
S6=[tex]\frac{-2,5*(-2^{6}-1) }{-2-1}[/tex]=-2,5*(64-1)/(-3)=-157,5/(-3)=52,5
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Ответ:
Sn=[tex]\frac{b1*(q^{n}-1) }{q-1}[/tex]
S6=[tex]\frac{-2,5*(-2^{6}-1) }{-2-1}[/tex]=-2,5*(64-1)/(-3)=-157,5/(-3)=52,5