| 1 | ||
∑n=0∞2nxn= | ||
| 1−2x |
| d | d | 1 | |||
(∑n=0∞2nxn)= | ( | ) | |||
| dx | dx | 1−2x |
| 1 | ||
∑n=0∞n2nxn−1=− | (−2) | |
| (1−2x)2 |
| 2 | ||
∑n=0∞n2nxn−1= | ||
| (1−2x)2 |
| 2x | ||
∑n=0∞n2nxn= | ||
| (1−2x)2 |
| 1−(1−2x) | ||
∑n=0∞n2nxn= | ||
| (1−2x)2 |
| 1 | 1 | |||
∑n=0∞n2nxn= | − | |||
| (1−2x)2 | 1−2x |
| 5^2 | 52 |
| 2^{10} | 210 |
| a_2 | a2 |
| a_{25} | a25 |
| p{2} | √2 |
| p{81} | √81 |
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