计算(1十3十5十7十·····十99)一(2十4十6十8十·····十98)的值 (l十3十5十7···十99)一(2十4十6十8···十10...
1\u53413\u53415\u5341\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u534199\u4e00(2\u53414\u53416\u5341\u00b7\u00b7\u00b7\u00b7\u00b7\u00b7\u534198)=9\u2026\u2026+110\u2026\u2026
=119\u2026\u2026
\u89e3\uff1a(l\u53413\u53415\u53417\u00b7\u00b7\u00b7\u534199)\u5171\u670950\u4e2a\u6570\uff0c(2\u53414\u53416\u53418\u00b7\u00b7\u00b7\u5341100)\u5171\u670950\u4e2a\u6570\uff1b\u63091-2=-1,4-3=-1\u3002\u3002\u300299-100=-1\uff1b\u517150\u4e2a-1\uff0c
\u6240\u4ee5\uff0c(l\u53413\u53415\u53417\u00b7\u00b7\u00b7\u534199)\u4e00(2\u53414\u53416\u53418\u00b7\u00b7\u00b7\u5341100)=-50
=-1-1-1-……-1+99
=（-1）×49+99
=-49+99
=50
结果是50 把前后每一项对应起来相减 比如3-2 5-4... 最后是50个1相加 望采纳。
绛旓細=锛1+99锛+锛3+97锛+锛5+95锛+鈥︼紙49+51锛=100+100+鈥+100 =100x锛50/2锛=100x25 =2500
绛旓細5050 鏀跺熬鎯冲姞 鏈50瀵 涓棿杩樻湁涓50鎵浠ヨ捣鏉5050
绛旓細1鍗3鍗5鍗7鍗...37鍗39=400.鐢ㄧ畝渚挎柟娉曡绠 1+39=40,3+37=40,5+35=40,7+33=40,9+31=40,11+29=40,13+27=40,15+25=40,17+23=40,19+21=40,40*10=400.
绛旓細鏈鍚庢眰鍑哄叡鏈15椤癸紝鏄鏁伴」锛屼篃灏辨槸璇翠腑闂存湁涓涓暟鏄嫭绔嬬殑锛屾棤娉曞噾鎴30銆15梅2=7鈥︹1 涔熷氨鏄锛岃兘缁勫悎鎴30鐨勬湁7瀵癸紝灏辨槸30脳7=210銆傚墿涓嬬殑閭ｄ釜鐙珛鏁板嵆鏄30梅2=15銆傞偅涔堬紝绛旀灏卞嚭鏉ヤ簡锛210+15=225.1+3+5+7+9+11+鈥︹+29 椤规暟=锛29锛1锛壝2+1 =14+1 =15锛堥」锛夊師寮=...
绛旓細(1鍗3鍗5鍗7鍗鈥﹀崄211)涓(2鍗4鍗6鍗佲﹀崄210)=1+3+5+7+鈥︹+211-2-4-6-鈥︹-210 =1-2+3-4+5-鈥︹-210+211 =1+(3-2)+(5-4)+鈥︹+(211-210) 鍏105缁 =1+105 =106
绛旓細1鍗3鍗5鍗7...鍗19=[(1+19)/2]^2=100 鎴栬 浣犳妸寮澶村拰缁撳熬鐨勬暟瀛楀姞璧锋潵锛屽氨鏄1+19,3+17,5+15...杩欐牱涓嬪幓锛屽緱鍑100
绛旓細杩欓亾棰樼殑棣栧熬鐩稿姞閮芥槸20锛屾瘮濡1+19銆3+17銆5+15绛夌瓑锛屾诲叡鏄5瀵癸紝鍥犳 =(1+19)脳5 =20脳5 =100
绛旓細1鍗3+5鍗7鍗9...鍗97鍗99鐨勭畝绠楄繃绋嬪涓嬶細1锛3锛5锛7锛9锛嬧︹︼紜95锛97锛99 =(1+99) +(3+97) +(5+95) +...(49+51)=25*100 =2500 1+3+5+7+9+鈥︹+95+97+99鍙互鍙戠幇瑙勫緥鈥滃ご鈥濆拰鈥滃熬鈥濈浉鍔犵瓑浜100锛屽紡瀛愪腑涓鍏辨湁50涓鏁 鎵浠ュ師寮忥紳锛堬紙1+99锛+锛3+97锛+锛5+95...
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
绛旓細姣忕浉閭荤殑涓や釜鏁伴兘鐩稿樊2鈥斺旇繖鏄竴涓瓑宸暟鍒椼1鍒99鐨勫鏁颁竴鍏辨湁50涓1+99=100锛2+98=100锛3+97=100鈥︹49+51=100锛屼竴鍏辨湁25涓100銆1+3+5+7+鈥︹+97+99 =锛1+99锛壝50梅2 =2500
