王守恩
发表于 2018-6-3 16:12:20
本帖最后由 王守恩 于 2018-6-3 20:19 编辑
王守恩 发表于 2018-6-3 07:08
伟大的 "e"
并不神秘的"e"
王守恩
发表于 2018-6-3 19:45:35
本帖最后由 王守恩 于 2018-6-3 20:17 编辑
王守恩 发表于 2018-6-3 07:08
伟大的 "e"
\(\D “e”\ 连分数展开式中的节点数字说明\)
\(\D e^{\frac{1}{1}}的连分数=1,00,1,1,02,1,1,04,1,1,06,1,1,08,1,1,10,......\)
\(\D e^{\frac{1}{2}}的连分数=1,01,1,1,05,1,1,09,1,1,13,1,1,17,1,1,21,......\)
\(\D e^{\frac{1}{3}}的连分数=1,02,1,1,08,1,1,14,1,1,20,1,1,26,1,1,32,......\)
\(\D e^{\frac{1}{4}}的连分数=1,03,1,1,11,1,1,19,1,1,27,1,1,35,1,1,43,......\)
\(\D e^{\frac{1}{5}}的连分数=1,04,1,1,14,1,1,24,1,1,34,1,1,44,1,1,54,......\)
\(\D e^{\frac{1}{6}}的连分数=1,05,1,1,17,1,1,29,1,1,41,1,1,53,1,1,65,......\)
\(\D e^{\frac{1}{7}}的连分数=1,06,1,1,20,1,1,34,1,1,48,1,1,62,1,1,76,......\)
\(\D e^{\frac{1}{8}}的连分数=1,07,1,1,23,1,1,39,1,1,55,1,1,71,1,1,87,......\)
\(\D e^{\frac{1}{9}}的连分数=1,08,1,1,26,1,1,44,1,1,62,1,1,80,1,1,98,......\)
.........
王守恩
发表于 2018-6-4 06:58:08
王守恩 发表于 2018-6-3 19:45
\(\D “e”\ 连分数展开式中的节点数字说明\)
\(\D e^{\frac{1}{1}}的 ...
伟大的 "e"
\(\D e=2^{{(1 -\frac{1}{2}+\frac{1}{3} -\frac{1}{4}+\frac{1}{5} -\frac{1}{6}+\frac{1}{7} -\frac{1}{8}+\frac{1}{9} -\frac{1}{10}+\frac{1}{11} -\frac{1}{12}......)}^{-1}}\)
\(\D e=3^{{(1+\frac{1}{2} -\frac{2}{3}+\frac{1}{4}+\frac{1}{5} -\frac{2}{6}+\frac{1}{7}+\frac{1}{8} -\frac{2}{9}+\frac{1}{10}+\frac{1}{11} -\frac{2}{12}......)}^{-1}}\)
\(\D e=4^{{(1+\frac{1}{2}+\frac{1}{3} -\frac{3}{4}+\frac{1}{5}+\frac{1}{6}+\frac{1}{7} -\frac{3}{8}+\frac{1}{9}+\frac{1}{10}+\frac{1}{11} -\frac{3}{12}......)}^{-1}}\)
\(\D e=5^{{(1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4} -\frac{4}{5}+\frac{1}{6}+\frac{1}{7}+\frac{1}{8}+\frac{1}{9} -\frac{4}{10}+\frac{1}{11}+\frac{1}{12}......)}^{-1}}\)
\(\D e=6^{{(1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5} -\frac{5}{6}+\frac{1}{7}+\frac{1}{8}+\frac{1}{9}+\frac{1}{10}+\frac{1}{11} -\frac{5}{12}......)}^{-1}}\)
\(\D e=7^{{(1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{1}{6} -\frac{6}{7}+\frac{1}{8}+\frac{1}{9}+\frac{1}{10}+\frac{1}{11}+\frac{1}{12}......)}^{-1}}\)
\(\D e=8^{{(1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{1}{6}+\frac{1}{7} -\frac{7}{8}+\frac{1}{9}+\frac{1}{10}+\frac{1}{11}+\frac{1}{12}......)}^{-1}}\)
\(\D e=9^{{(1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{1}{6}+\frac{1}{7}+\frac{1}{8} -\frac{8}{9}+\frac{1}{10}+\frac{1}{11}+\frac{1}{12}......)}^{-1}}\)
\(......\)
王守恩
发表于 2018-6-5 12:44:30
本帖最后由 王守恩 于 2018-6-5 14:10 编辑
王守恩 发表于 2018-6-4 06:58
伟大的 "e"
\(\D e=2^{{(1 -\frac{1}{2}+\frac{1}{3} -\frac{1}{4}+\frac{1}{5} -\frac{1}{ ...
\(\D n\ 是自然数 ,x\ 是任意数\)
\(\D求证:\sum_{i=0}^n\(-1)^i\C_n^i\(x-i)^n\ =\ n\ !\)
\(\D 1×0^0=0!\)
\(\D 1×1^1-1×0^1=1!\)
\(\D 1×2^2-2×1^2+01×0^2=2!\)
\(\D 1×3^3-3×2^3+03×1^3-01×0^3=3!\)
\(\D 1×4^4-4×3^4+06×2^4-04×1^4+01×0^4=4!\)
\(\D 1×5^5-5×4^5+10×3^5-10×2^5+05×1^5-01×0^5=5!\)
\(\D 1×6^6-6×5^6+15×4^6-20×3^6+15×2^6-06×1^6+01×0^6=6!\)
\(\D 1×7^7-7×6^7+21×5^7-35×4^7+35×3^7-21×2^7+07×1^7-1×0^7=7!\)
\(\D 1×8^8-8×7^8+28×6^8-56×5^8+70×4^8-56×3^8+28×2^8-8×1^8+1×0^8=8!\)
王守恩
发表于 2018-6-5 18:27:45
王守恩 发表于 2018-6-5 12:44
\(\D n\ 是自然数 ,x\ 是任意数\)
\(\D求证:\sum_{i=0}^n\(-1)^i\C_n^i\(x-i)^n\ = ...
\({\large e }\approx\left(\frac{3}{2}\right)^{\sqrt{3×2.5×2}}\approx\left(\frac{4}{3}\right)^{\sqrt{4×3.5×3}}\approx\left(\frac{5}{4}\right)^{\sqrt{5×4.5×4}}\)
\(\approx\left(\frac{6}{5}\right)^{\sqrt{6×5.5×5}}\approx\left(\frac{7}{6}\right)^{\sqrt{7×6.5×6}}\approx\left(\frac{8}{7}\right)^{\sqrt{8×7.5×7}}\)
\(\approx\left(\frac{9}{8}\right)^{\sqrt{9×8.5×8}}\approx\left(\frac{10}{9}\right)^{\sqrt{10×9.5×9}}\approx\left(\frac{11}{10}\right)^{\sqrt{11×10.5×10}}\)
\(......\)
\(\left(\frac{8}{7}\right)^{\sqrt{8×7.5×7}}=2.71828\)
\(\left(\frac{46}{45}\right)^{\sqrt{46×45.5×45}}=2.718281828\)
aimisiyou
发表于 2018-6-5 19:17:55
王守恩 发表于 2018-6-5 18:27
\({\large e }\approx\left(\frac{3}{2}\right)^{\sqrt{3×2.5×2 ...
$$这跟\left(1+\frac{1}{n}\right)^{n}\approx e有什么区别么?$$
王守恩
发表于 2018-6-6 10:45:35
本帖最后由 王守恩 于 2018-6-6 12:00 编辑
aimisiyou 发表于 2018-6-5 19:17
$$这跟\left(1+\frac{1}{n}\right)^{n}\approx e有什么区别么?$$
底数不一定是 (n+1)/n,底数可以是任意数!
我是说:千军万马都在向 “e” 靠拢!例如 ”7“。
\({\large e }\approx\left(\frac{1}{7}\right)^{\sqrt{1×4×7}/(-6)}\approx\left(\frac{2}{7}\right)^{\sqrt{2×4.5×7}/(-5)}\approx\left(\frac{3}{7}\right)^{\sqrt{3×5×7}/(-4)}\)
\(\approx\left(\frac{4}{7}\right)^{\sqrt{4×5.5×7}/(-3)}\approx\left(\frac{5}{7}\right)^{\sqrt{5×6×7}/(-2)}\approx\left(\frac{6}{7}\right)^{\sqrt{6×6.5×7}/(-1)}\)
\(\approx\left(\frac{8}{7}\right)^{\sqrt{8×7.5×7}/1}\approx\left(\frac{9}{7}\right)^{\sqrt{9×8×7}/2}\approx\left(\frac{10}{7}\right)^{\sqrt{10×8.5×7}/3}\)
\(\approx\left(\frac{11}{7}\right)^{\sqrt{11×9×7}/4}\approx\left(\frac{12}{7}\right)^{\sqrt{12×9.5×7}/5}\approx\left(\frac{13}{7}\right)^{\sqrt{13×10×7}/6}\)
\(.......\)
王守恩
发表于 2018-6-6 13:03:38
aimisiyou 发表于 2018-6-5 19:17
$$这跟\left(1+\frac{1}{n}\right)^{n}\approx e有什么区别么?$$
还是“7”!效率就高了!!
\({\large e }\approx\left(\frac{6.2}{7}\right)^{\sqrt{6.2×6.6×7}/(-0.8)}\approx\left(\frac{6.5}{7}\right)^{\sqrt{6.5×6.75×7}/(-0.5)}\approx\left(\frac{6.8}{7}\right)^{\sqrt{6.8×6.9×7}/(-0.2)}\)
\(\approx\left(\frac{6.9}{7}\right)^{\sqrt{6.9×6.95×7}/(-0.1)}\approx\left(\frac{6.99}{7}\right)^{\sqrt{6.99×6.995×7}/(-0.01)}\approx\left(\frac{6.999}{7}\right)^{\sqrt{6.999×6.9995×7}/(-0.001)}\)
\(\approx\left(\frac{7.001}{7}\right)^{\sqrt{7.001×7.0005×7}/0.001}\approx\left(\frac{7.01}{7}\right)^{\sqrt{7.01×7.005×7}/0.01}\approx\left(\frac{7.1}{7}\right)^{\sqrt{7.1×7.05×7}/0.1}\)
\(\approx\left(\frac{7.2}{7}\right)^{\sqrt{7.2×7.1×7}/0.2}\approx\left(\frac{7.5}{7}\right)^{\sqrt{7.5×7.25×7}/0.5}\approx\left(\frac{7.8}{7}\right)^{\sqrt{7.8×7.4×7}/0.8}\)
\(.......\)
王守恩
发表于 2023-11-23 06:41:35
挑战一下(好玩)!对于同一个“n”来说,下面的算法永远是成立的?举个反例??来个更好的???
\(\big(\frac{n+1}{n}\big)^n<\big(\frac{2n^2+n+2}{2n^2-n+2}\big)^n< e<\big(\frac{2n^3+n^2+2}{2n^3-n^2+2}\big)^n<\big(\frac{n}{n-1}\big)^n\)
nyy
发表于 2023-11-23 08:29:53
e再牛逼,也要向10屈服,化学中有太多的用10不用e