100*99*98*97……3*2*1,得出来最后共有几个0? 10000-99-98-97-96…-6-5-4-3-2-1...
100*99*98*97*......*3*2*1\u7684\u4e58\u79ef\u4e2d,\u672b\u5c3e\u6709\u51e0\u4e2a\u8fde\u7eed\u76840.\u6bcf\u4e58\u4e00\u4e2a\u4e2a\u4f4d\u6570\u662f0\u7684\u5c31\u591a\u4e00\u4e2a\u96f6\uff0c\u6bcf\u51fa\u73b0\u4e00\u5bf9\u4e2a\u4f4d\u662f2\u7684\u548c\u4e2a\u4f4d\u662f5\u7684\u76f8\u4e58\u4e5f\u53ef\u4ee5\u589e\u52a00
\u4e0d\u8ba1100\uff0c\u5219\u4e2a\u4f4d\u6570\u662f0\u7684\u6709
10\uff0c20\uff0c30\uff0c40\uff0c50\uff0c60\uff0c70\uff0c80\uff0c90\uff0c\u51719\u4e2a0
\u4e2a\u4f4d\u662f2\u7684\u548c\u4e2a\u4f4d\u662f5\u7684\u76f8\u4e58\u7684\u6709
2*5\uff0c12*15\uff0c22*25\uff0c32*35\uff0c42*45\uff0c52*55\uff0c62*65\uff0c72*75\uff0c82*85\uff0c92*95
\u5176\u4e2d62*65=4030\uff0c72*75=5400\uff0c\u6bd4\u5176\u4f59\u7684\u591a\u4e00\u4e2a0
\u6240\u4ee5\u8fd9\u91cc\u4e00\u517112\u4e2a0
\u518d\u7b97\u4e0a100\uff0c\u4e58\u4ee5100\u53ef\u4ee5\u52a0\u4e0a\u4e24\u4e2a0
\u7efc\u4e0a\uff0c\u4e00\u51719+12+2=23\u4e2a0
\u539f\u5f0f=10000-\uff0899+98+97+......+3+2+1\uff09
=10000-\uff081+99\uff09\u00d799\u00f72
=10000-50\u00d799
=10000-4950
=5050
一共24个零 乘到50 遇到12个零 75的时候遇到18个零 100的时候24个零
绛旓細绛旀鏄袱涓0銆傚叾涓紝浠庡洜鏁10寰楀埌1涓0锛屼粠鍥犳暟2鍜5鐩镐箻鍙堝緱鍒1涓0锛屽叡璁′袱涓 鍒氬ソ涓や釜0锛熶細涓嶄細鍐嶅鍑犱釜鍛紵 濡傛灉涓嶇浉淇★紝鍙互鎶婁箻绉绠楀嚭鏉ワ紝缁撴灉寰楀埌 鍘熷紡=3628800銆備綘鐪嬶紝涔樼Н鐨勬湯灏惧垰濂戒袱涓0锛屾兂澶1涓篃娌℃湁銆 閭d箞锛屽鏋滄墿澶ц妯★紝鎷夐暱闃熶紞鍛紵璀璇达紝浠1涔樺埌20锛 ...
绛旓細缁间笂锛屼竴鍏9+12+2=23涓0
绛旓細100锛 = 100*99*98*97*鈥︹*3*2*1 98锛 = 98*97*96*鈥︹*3*2*1 鐒跺悗绾﹀垎 寰楋細100脳99锛9900
绛旓細鐢遍鎰忓彲鐭ワ細100锛=100x99x...x1 98!=98x97x96...x1 鎵浠ワ細100锛/98锛=100x99=9900 鎵浠ラ塁
绛旓細鏄笉鏄绠100!/99!锛100!=100脳99脳98脳鈥︹γ2脳1 99!=99脳98脳鈥︹γ2脳1 鎵浠100!/99!=(100脳99脳98脳鈥︹γ2脳1)/(99脳98脳鈥︹γ2脳1)=100
绛旓細100锛=100*99*98...*1=9.3326215443944152681699238856267e+157 98锛=98*97...*1=9.4268904488832477456261857430572e+153
绛旓細妤间笂鐨勬柟娉曠‘瀹炴槸瀵圭殑锛屽鏋滀綘娌$湅鎳傛垜鍐嶈缁嗕竴涓嬶紝灏100/97鍒嗗瓙鍒嗘瘝鍚屼箻浠99*98锛屽皢100*99/97*96鍒嗗瓙鍒嗘瘝鍚屼箻浠98锛100*99*98/97*96*95涓嶅彉锛屽悗闈㈢殑鍒嗗紡娑堝幓98鍚庨潰鐨勬暟灏嗗垎姣嶉兘鍙樹负100*99*98锛屽墿涓嬬殑鍙渶瑕佽绠1/(99*98*97) +銆傘傘+1/(3*2*1)灏嗘瘡涓垎寮忔寜鐓1/(99*98*97)= ...
绛旓細浣犳墍璋撶殑100脳99脳98脳97脳96脳鈥︹γ2脳1锛屼篃灏辨槸100鐨勯樁涔橈紝涔熷彲浠ョ畝鍐欎綔鈥100锛佲濓紝濡傛灉浣犲鏁板鏈夋洿娣卞叆鐐圭殑鎺ヨЕ鐨勮瘽锛屽氨浼氭槑鐧介樁涔樻湰韬槸娌℃湁绠渚胯繍绠楀彲瑷鐨勶紝鍙彲浠ョ‖绠楋紝濡傛灉浣犳兂璁$畻鏇村ぇ鐨勬暟锛屾垜寤鸿浣犱笂鐧惧害瀵绘壘璁$畻闃朵箻鐨勮蒋浠讹紝鍚澶氬ぇ鐨勬暟閮借兘璁$畻鍑烘潵銆傚鏋滀綘瀵硅绠楁満缂栫▼鏈夋墍浜嗚В鐨...
绛旓細鍘熷紡锛1锛2/(1*4) +1+2*(4*7) + 1 + 2/ (7*10) +...+ 1+ 2/(97*100)鏍规嵁绛夊樊鏁板垪锛氥97= 1 + (n-1) *3 鎵浠ユ眰鍑恒杩欎釜椤规暟涓鍏辨湁33椤癸紝鎵浠 鍘熷紡锛33 + 2/3 * [ 1- 1/4 +1/4 - 1/7 + 1/7 - 1/10 +...+ 1/97 - 1/100) ]= 33 + 2/3...
绛旓細涓昏鑰冨療鍥犳暟5鐨勪釜鏁 100梅5=20涓 100梅25=4涓 20+4=24涓 绛旓細1*2*3*4*5*鈥︹*97*98*99*100绉殑鏈熬鏈24涓0銆