(l十3十5十7···十99)一(2十4十6十8···十100)等于多少 1―2十3一4十5一6十7一8十······十99一100的...
\u7528\u7b80\u4fbf\u65b9\u6cd5\u8ba1\u7b97\u3002\uff08\u5217\u8131\u5f0f\uff09 \uff082\u53414\u53416\u00b7\u00b7\u00b7\u5341100\uff09\u4e00\uff081\u53413\u53415\u5341\u00b7\u00b7\u00b7\u534199\uff09\uff082\u53414\u53416\u00b7\u00b7\u00b7\u5341100\uff09\u4e00\uff081\u53413\u53415\u5341\u00b7\u00b7\u00b7\u534199\uff09
=2-1+3-2+...........100-99
=1x99
=99
1\u20152\u53413\u4e004\u53415\u4e006\u53417\u4e008\u5341\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u534199\u4e00100
=-1-1-1-.....-1
=-50
\u6bcf2\u4e2a\u6570\u7684\u5dee=-1\uff0c\u5171100\u00f72=50\u4e2a-1
所以,(l十3十5十7···十99)一(2十4十6十8···十100)=-50
1加99乘以99除以2,,,,减去,,,,2加100乘以99除以二,最终得
绛旓細瑙o細(l鍗3鍗5鍗7路路路鍗99)鍏辨湁50涓暟锛(2鍗4鍗6鍗8路路路鍗100)鍏辨湁50涓暟锛涙寜1-2=-1,4-3=-1銆傘傘99-100=-1锛涘叡50涓-1锛屾墍浠ワ紝(l鍗3鍗5鍗7路路路鍗99)涓(2鍗4鍗6鍗8路路路鍗100)=-50
绛旓細2500
绛旓細锛1+99锛脳99梅2
绛旓細1鍗3鍗5鍗7鍗9鍗⋯⋯鍗99 锛濓紙锛1鍗3鍗5鍗7鍗9鍗⋯⋯鍗99锛夊崄锛1鍗3鍗5鍗7鍗9鍗⋯⋯鍗99锛夛級梅 2 锛濓紙锛1鍗99锛夊崄锛3鍗97锛夊崄锛5鍗95锛夊崄⋯⋯鍗侊紙99鍗1锛夛級梅 2 锛 100 x 50 梅 2 锛 2500 ...
绛旓細1鍗3鍗5鍗7鍗9绛夊姞鍒99绠渚挎柟娉曪細鐢1,3,5,.99鍏辫50涓暣鏁 鏁呰S=1+3+5+...+99 寰 S=99+97+95+...+1 涓ゅ紡鐩稿姞寰 2S=(1+99)+(3+97)+...+(99+1)鍗2S=50脳100 鍗砈=25脳100=2500 鏁 1鍗3鍗5鍗7鍗9鍗伮仿仿鍗99=2500 ...
绛旓細瑙o細鍘熷紡=(1-2)+(3-4)+鈥︹+锛97-98锛+99 =-1-1-1-鈥︹-1+99 =锛-1锛壝49+99 =-49+99 =50
绛旓細1鍗3鍗5鍗7鍗9鍗伮仿仿鍗99=锛1+99锛脳99梅2梅2=2475
绛旓細鎮ㄥソ锛佺畝渚胯绠楀叕寮忓涓嬶細1+3+5+7鈥︹+97+99 =锛1+99锛*50/2 =5000/2 =2500 杩欐槸涓涓瓑宸暟鍒楋紝璁$畻鏂规硶鏄紙棣栭」+鏈」锛*椤规暟/2 甯屾湜瀵规偍鏈夊府鍔
绛旓細1鍗3鍗5鍗7鍗9鍗伮仿仿鍗99 =锛1+99锛x50梅2 =100x25 =2500
绛旓細鐢ㄧ畝渚挎柟娉曠畻1鍗3鍗5鍗7鍗鈥﹀崄97鍗99鎬庢牱绠绠椾究鍐欏瞼寮忓瓙 鎴戞潵绛 4涓洖绛 #鐑# 鎴愬勾浜虹殑鎶戦儊鏄惁澶у鍥犱负娌¢挶? 鏄熻景涓嬬殑鍏斿厰 2015-08-14 路 TA鑾峰緱瓒呰繃124涓禐 鐭ラ亾绛斾富 鍥炵瓟閲:189 閲囩撼鐜:0% 甯姪鐨勪汉:26涓 鎴戜篃鍘荤瓟棰樿闂釜浜洪〉 鍏虫敞 灞曞紑鍏ㄩ儴 (1+99)+(3+97)+鈥︹ 宸...