1(1+1)(2*1+1) | ||
12= | ✔ | |
6 |
n(n+1)(2n+1) | ||
12+22+...+n2= | ||
6 |
n(n+1)(2n+1) | ||
12+22+...+n2+(n+1)2= | +(n+1)2= | |
6 |
n(n+1)(2n+1)+6(n+1)2 | (n+1)(n(2n+1)+6(n+1)) | |||
= | = | = | ||
6 | 6 |
(n+1)(2n2+7n+6) | (n+1)(n+2)(2n+3) | (n+1)((n+1)+1)(2(n+1)+1) | ||||
= | = | = | ✔ | |||
6 | 6 | 6 |
5^2 | 52 |
2^{10} | 210 |
a_2 | a2 |
a_{25} | a25 |
p{2} | √2 |
p{81} | √81 |
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