͹ءÃÁàÈÉÊèǹ ªèÇÂ˹èͤÃѺ
ÚB=$\frac{1}{334x1000}+\frac{1}{335x999}+\frac{1}{336x998}+...+\frac{1}{1000x334}$
|
http://m.wolframalpha.com/input/?i=s...%29%29&x=0&y=0
·Ò§ÍÍ¡ÊØ´·éÒ 0.000824671 |
ÍéÒ§ÍÔ§:
|
Íѹ¹Õé¡çäÁè·ÃÒº¤ÃѺ
áµè⨷Âì¶ÒÁẺ¹ÕéàÅÂËÃͤÃѺ(ãËéËÒ¤èҵçæ) |
¨Ò¡¡ÒäҴà´Ò¼Á¤Ô´ÇèÒÁѹ¤×ÍàÈÉÊèǹºÇ¡¡Ñ¹ä»àÃ×èÍÂæ
|
ÍéÒ§ÍÔ§:
ÃٻẺà»ç¹àÈÉÊèǹÊÁÁҵà B=$2\left(\frac{1}{(667-333) \times (667+333)}+\frac{1}{(667-332)\times (667+332)}+\frac{1}{(667-331)\times (667+331)}+...+\frac{1}{(667-1) \times (667+1)} \right) + \frac{1}{367\times 367} $ B=$2\left(\frac{1}{(667^2-333^2) }+\frac{1}{(667^2-332^2)}+\frac{1}{(667^2-331^2)}+...+\frac{1}{(667^2-1^2) } \right) + \frac{1}{367^2} $ ãËé $ \ a = 667$ B=$2\left(\frac{1}{(a^2-(a-334)^2) }+\frac{1}{(a^2-(a-335)^2)}+\frac{1}{(a^2-(a-336)^2)}+...+\frac{1}{(a^2-(a-666)^2) } \right) + \frac{1}{667^2} $ 仵èÍäÁè¶Ù¡ |
B=$\frac{1}{334 \times 1000}+\frac{1}{335\times 999}+\frac{1}{336\times 998}+...+\frac{1}{367\times 367} ...+\frac{1}{336\times 998}+\frac{1}{335\times 999}+\frac{1}{1000\times 334}$
B=$2 [\frac{1}{334 \times 1000}+\frac{1}{335\times 999}+\frac{1}{336\times 998}+...+\frac{1}{667\times 667}] - \frac{1}{667\times 667}$ 1334 B= $2[\frac{1334}{334 \times 1000}+\frac{1334}{335\times 999}+\frac{1334}{336\times 998}+...+\frac{1334}{667\times 667}] - \frac{1334}{667\times 667}$ 1334 B=$2[\frac{1}{334}+\frac{1}{1000}+\frac{1}{335}+\frac{1}{999}+...+\frac{1}{667}+\frac{1}{667}] - [\frac{1}{667}+\frac{1}{667}]$ 1334 B=$2[\frac{1}{334}+\frac{1}{335}+\frac{1}{336}+...+\frac{1}{667}+...+\frac{1}{1000}]$ 667 B=$\frac{1}{334}+\frac{1}{335}+\frac{1}{336}+...+\frac{1}{667}+...+\frac{1}{1000}$ |
âË ¹Õè⨷ÂìÁ.µé¹¨ÃÔ§àËÃͤÃѺà¹Õè ¼Áà¢éÒÁÒ¼Ô´·ÕèÃÖà»ÅèÒ :aah:
|
¢Íº¤Ø³ÁÒ¡æ¤ÃѺ ¢é͹Õé⨷ÂìÁ.µé¹¤ÃѺ äÇéà´Ç¼Áâ¾Ê⨷ÂìÍÕ¡¢éÍ·Õè¤ÅéÒÂæà຺¹Õé
|
- - áÅéǺǡ¡Ñ¹Âѧä§ËÃͤÃѺ
|
´ÙÇÔ¸Õ·ÓáÅéǧ§ÍèÐ 555+
|
àÇÅÒ·ÕèáÊ´§·Ñé§ËÁ´ à»ç¹àÇÅÒ·Õè»ÃÐà·Èä·Â (GMT +7) ¢³Ð¹Õéà»ç¹àÇÅÒ 19:59 |
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Modified by Jetsada Karnpracha