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calculati (3/10+3/100+3/1000+...):100

Răspuns :

Salut,

[tex]\dfrac{\dfrac{3}{10}+\dfrac{3}{100}+\dfrac{3}{1000}+\ldots}{100}=\dfrac{3}{1000}+\dfrac{3}{10000}+\dfrac{3}{100000}+\ldots=\\\\=\dfrac{3}{10^3}+\dfrac{3}{10^4}+\dfrac{3}{10^5}+\ldots=3\cdot 10^{-3}+3\cdot 10^{-4}+3\cdot 10^{-5}+\ldots[/tex]

Green eyes.
[tex] \frac{3}{10}+\frac{3}{100}+\frac{3}{1000}+\frac{3}{10000}+... = 0,333333... = 0,(3) \\ \\ \Rightarrow (\frac{3}{10}+\frac{3}{100}+\frac{3}{1000}+\frac{3}{10000}+...):100 = 0,(3):100 = \frac{3}{9}:100= \\ \\ = \frac{3}{9}\cdot \frac{1}{100} = \frac{3}{900} = \frac{1}{300} = 0,00(3)[/tex]