Ответ:
S5=а1(1-q^5)/(1-q); 155=a1(1-2^5)/(1-2);
155=a1(1-32)/(1-2); 155=a1(-31)/(-1); a1=155/31; a1=5
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Ответ:
S5=а1(1-q^5)/(1-q); 155=a1(1-2^5)/(1-2);
155=a1(1-32)/(1-2); 155=a1(-31)/(-1); a1=155/31; a1=5