Title Text
\dfrac{1}{1-r}=1+r+r^2+\cdots
1
1
−
r
=
1
+
r
+
r
2
+
⋯
\dfrac{1}{1-r}=1+r+r^2+\cdots
1
−
r
1
=
1
+
r
+
r
2
+
⋯
ただし
|r|<1
∣
r
∣
<
1
|r|<1
∣
r
∣
<
1
(-1< r<1)
(
−
1
<
r
<
1
)
(-1< r<1)
(
−
1
<
r
<
1
)
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