Ответ:
q=1/3; S=a1/(1-q); a3=a1•q²; a1=a3:q²; a1=3:1/9=3•9=27
S=27/(1-1/3)=27/2/3=27•3/2=81/2=40,5
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Ответ:
q=1/3; S=a1/(1-q); a3=a1•q²; a1=a3:q²; a1=3:1/9=3•9=27
S=27/(1-1/3)=27/2/3=27•3/2=81/2=40,5