Title Text

\dfrac{1}{1-r}=1+r+r^2+\cdots
11−r=1+r+r2+⋯\dfrac{1}{1-r}=1+r+r^2+\cdots

　ただし

|r|<1
∣r∣<1|r|<1
(-1< r<1)
(−1<r<1)(-1< r<1)

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