2 Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; GTB7.3; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30) /rde/contents/library/ps2img/cgi-bin/eqn2gif.cgi 157.118.3.12 1340186716 2012/06/20 19:05:16 f'(x)&\simeq&\frac{f(x+dx)-f(x)}{dx}\nonumber\\ f''(x)&\simeq&\frac{f'(x+dx)-f'(x)}{dx}\nonumber\\ &=&\frac{f'(x)-f'(x-dx)}{dx}\nonumber\\ &=&\frac{\frac{f'(x+dx)-f'(x)}{dx}-\frac{f'(x)-f'(x-dx)}{dx}}{dx}\nonumber\\ &=&\frac{1}{(dx)^2}((f'(x+dx)-f'(x))-(f'(x)-f'(x-dx)))\nonumber\\ &=&\frac{1}{(dx)^2}(f'(x+dx)-f'(x)-f'(x)+f'(x-dx))\nonumber\\ &=&\frac{1}{(dx)^2}((f'(x+dx)+f'(x-dx))-2f'(x))\nonumber\\ 52 ______(________________________) <IMG SRC="../cgi-cache/20120620_185050.gif"> ______ 正常に処理されました 20120620_185050 http://www.mech.tohoku-gakuin.ac.jp/rde/contents/library/ps2img/eqn2gif_online.html Wed Jun 20 19:05:16 2012