РЕШИТЕ СРОЧНО!!!!!!!!!!

Question

РЕШИТЕ СРОЧНО!!!!!!!!!!

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Answer 1

4
q=4,b1=1/8
S5=b1*(q^5-1)/(q-1)
S5=1/8*(1024-1):(4-1)=1/8*1023*1/3=341/8=42,625
5
b1=-648,b2=108
q=b2/b1

q=-108/648

q=-1/6
S5=b1*(1-q^5)/(1-q)
S5=-648*(1+1/7776):(1+1/6)=-648*7777/7776*6/7=-648*1111/1296=-1111/2=-555,5