Ответ:
Объяснение:
b1=27;
q=b2/b1=-9/27= -1/3;
S=b1/(1-q)=27/(1+1/3)=81/4=20+1/4
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Ответ:
Объяснение:
b1=27;
q=b2/b1=-9/27= -1/3;
S=b1/(1-q)=27/(1+1/3)=81/4=20+1/4