10 Mozilla/5.0 (Linux; Android 8.0.0; SCV37) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.105 Mobile Safari/537.36 /rde/contents/library/ps2img/cgi-bin/eqn2gif.cgi 157.118.205.34 1550033145 2019/02/13 13:45:45 && \sum_{k=0}^n \frac {k!}{(n+k)!} \\ &=& \sum_{k=0}^n \frac 1{n-1} \left( \frac{k!}{(k+n-1)!} - \frac{(k+1)!}{(k+n)!} \right) \\ &=& \frac 1{n-1} \left( \frac 1{n!} - \frac{(n+1)!}{(2n)!} \right) 4 <IMG SRC="../cgi-cache/20190213_134439.gif"> 変換 正常に処理されました 20190213_134439 http://www.mech.tohoku-gakuin.ac.jp/rde/contents/library/ps2img/eqn2gif_online.html Wed Feb 13 13:45:45 2019