Объяснение:
[tex]\frac{2}{3};\ \frac{4}{9};\ \frac{8}{27};\ ...\\ q=\frac{\frac{4}{9} }{\frac{2}{3} }=\frac{2}{3}.\\ S=\frac{b_1}{1-q}= \frac{\frac{2}{3} }{1-\frac{2}{3} } =\frac{\frac{2}{3} }{\frac{1}{3} }=2.[/tex]
Ответ: S=2.
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Объяснение:
[tex]\frac{2}{3};\ \frac{4}{9};\ \frac{8}{27};\ ...\\ q=\frac{\frac{4}{9} }{\frac{2}{3} }=\frac{2}{3}.\\ S=\frac{b_1}{1-q}= \frac{\frac{2}{3} }{1-\frac{2}{3} } =\frac{\frac{2}{3} }{\frac{1}{3} }=2.[/tex]
Ответ: S=2.