Ответ:
b4=-1/3 S6=-121/9
Объяснение:
S6=b1(q^n-1)/q-1
S6= -9((1/3^5)-1)/1/3-1=-9*(-242/243)/-2/3=242/27/-2/3=26/3/-2/3= -121/9
bn=b1*q^n-1
b4=-9*(1/3)³=-9*1/27= -1/3
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Ответ:
b4=-1/3 S6=-121/9
Объяснение:
S6=b1(q^n-1)/q-1
S6= -9((1/3^5)-1)/1/3-1=-9*(-242/243)/-2/3=242/27/-2/3=26/3/-2/3= -121/9
bn=b1*q^n-1
b4=-9*(1/3)³=-9*1/27= -1/3