tylko najpierw jakos muszę pomnozyć/podzielić przez x ? 
| xn | ||
Niech f(x)=∑1∞ | | ()' | |
| 3n+1 |
| nxn−1 | ||
f'(x)=∑1∞ | | *3 | |
| 3n+1 |
| 3nxn−1 | (3n+1)xn−1−xn−1 | |||
3f'(x)=∑1∞ | =∑1∞ | = | ||
| 3n+1 | 3n+1 |
| xn−1 | 1 | |||
∑1∞ xn−1 −∑1∞ | = | −f(x)/x | ||
| 3n+1 | 1−x |
| x | ||
3f'(x)*x= | −f(x) | |
| 1−x |
| 5^2 | 52 |
| 2^{10} | 210 |
| a_2 | a2 |
| a_{25} | a25 |
| p{2} | √2 |
| p{81} | √81 |
| Kliknij po więcej przykładów | |
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| Twój nick | |