三年级奥数专题：巧求周长习题及答案(A)[1] 三年级奥数题及答案100道
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3\u00d7\uff0812\uff0d1\uff09\uff1d33\u68f5\u3002
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200\u00f710\uff1d20\u6bb5\uff0c20\uff0d1\uff1d19\u6b21\u3002
4.\u8682\u8681\u722c\u6811\u679d\uff0c\u6bcf\u4e0a\u4e00\u8282\u9700\u898110\u79d2\u949f\uff0c\u4ece\u7b2c\u4e00\u8282\u722c\u5230\u7b2c13\u8282\u9700\u8981\u591a\u5c11\u5206\u949f\uff1f
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5.\u5728\u82b1\u5703\u7684\u5468\u56f4\u65b9\u5f0f\u83ca\u82b1\uff0c\u6bcf\u96941\u7c73\u653e1\u76c6\u82b1\u3002\u82b1\u5703\u5468\u56f4\u517120\u7c73\u957f\u3002\u9700\u653e\u591a\u5c11\u76c6\u83ca\u82b1\uff1f
20\u00f71\u00d71\uff1d20\u76c6
6.\u4ece\u53d1\u7535\u5382\u5230\u95f9\u5e02\u533a\u4e00\u5171\u6709250\u6839\u7535\u7ebf\u6746\uff0c\u6bcf\u76f8\u90bb\u4e24\u6839\u7535\u7ebf\u6746\u4e4b\u95f4\u662f30\u7c73\u3002\u4ece\u53d1\u7535\u5382\u5230\u95f9\u5e02\u533a\u6709\u591a\u8fdc\uff1f
30\u00d7\uff08250\uff0d1\uff09\uff1d7470\u7c73\u3002
7.\u738b\u8001\u5e08\u628a\u6708\u6536\u5165\u7684\u4e00\u534a\u53c820\u5143\u7559\u505a\u751f\u6d3b\u8d39\uff0c\u53c8\u628a\u5269\u4f59\u94b1\u7684\u4e00\u534a\u53c850\u5143\u50a8\u84c4\u8d77\u6765\uff0c\u8fd9\u65f6\u8fd8\u526940\u5143\u7ed9\u5b69\u5b50\u4ea4\u5b66\u8d39\u4e66\u672c\u8d39\u3002\u4ed6\u8fd9\u4e2a\u6708\u6536\u5165\u591a\u5c11\u5143\uff1f
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1\u00d72\u00d72\uff1d4\u5343\u7c73
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27.\u4e00\u5934\u8c61\u7684\u91cd\u91cf\u7b49\u4e8e4\u5934\u725b\u7684\u91cd\u91cf\uff0c\u4e00\u5934\u725b\u7684\u91cd\u91cf\u7b49\u4e8e3\u5339\u5c0f\u9a6c\u7684\u91cd\u91cf\uff0c\u4e00\u5339\u5c0f\u9a6c\u7684\u91cd\u91cf\u7b49\u4e8e3\u5934\u5c0f\u732a\u7684\u91cd\u91cf\u3002\u95ee\uff1a\u4e00\u5934\u8c61\u7684\u91cd\u91cf\u7b49\u4e8e\u51e0\u5934\u5c0f\u732a\u7684\u91cd\u91cf\uff1f
\u7b54\u6848\uff1a4\u00d73\u00d73=36\uff0c\u6240\u4ee5\u4e00\u5934\u8c61\u7684\u91cd\u91cf\u7b49\u4e8e36\u5934\u5c0f\u732a\u7684\u91cd\u91cf\u3002
28.\u7532\u3001\u4e59\u3001\u4e19\u4e09\u4eba\uff0c\u4e00\u4e2a\u4eba\u559c\u6b22\u770b\u8db3\u7403\uff0c\u4e00\u4e2a\u4eba\u559c\u6b22\u770b\u62f3\u51fb\uff0c\u4e00\u4e2a\u4eba\u559c\u6b22\u770b\u7bee\u7403\u3002\u5df2\u77e5\u7532\u4e0d\u7231\u770b\u7bee\u7403\uff0c\u4e19\u65e2\u4e0d\u559c\u6b22\u770b\u7bee\u7403\u53c8\u4e0d\u559c\u6b22\u770b\u8db3\u7403\u3002\u73b0\u6709\u8db3\u7403\u3001\u62f3\u51fb\u3001\u7bee\u7403\u6bd4\u8d5b\u7684\u5165\u573a\u5238\u5404\u4e00\u5f20\u3002\u8bf7\u6839\u636e\u4ed6\u4eec\u7684\u7231\u597d\uff0c\u628a\u7968\u5206\u7ed9\u4ed6\u4eec\u3002
\u7b54\u6848\uff1a\u4e19\u4e0d\u559c\u6b22\u770b\u7bee\u7403\u4e0e\u8db3\u7403\uff0c\u5e94\u5c06\u62f3\u51fb\u5165\u573a\u5238\u7ed9\u4e19\u3002\u7532\u4e0d\u559c\u6b22\u770b\u7bee\u7403\uff0c\u5e94\u5c06\u8db3\u7403\u5165\u573a\u5238\u7ed9\u7532\u3002\u6700\u540e\uff0c\u5e94\u5c06\u7bee\u7403\u5165\u573a\u5238\u7ed9\u4e59\u3002
29.\u6709\u4e00\u5806\u94c1\u5757\u548c\u94dc\u5757\uff0c\u6bcf\u5757\u94c1\u5757\u91cd\u91cf\u5b8c\u5168\u4e00\u6837\uff0c\u6bcf\u5757\u94dc\u5757\u7684\u91cd\u91cf\u4e5f\u5b8c\u5168\u4e00\u6837\u30023\u5757\u94c1\u5feb\u548c5\u5757\u94dc\u5757\u5171\u91cd210\u514b\u30024\u5757\u94c1\u5757\u548c10\u5757\u94dc\u5757\u5171\u91cd380\u514b\u3002\u95ee\uff1a\u6bcf\u4e00\u5757\u94c1\u5757\u3001\u6bcf\u4e00\u5757\u94dc\u5757\u5404\u91cd\u591a\u5c11\uff1f
\u7b54\u6848\uff1a4\u5757\u94c1\u5757\u548c10\u5757\u94dc\u5757\u5171\u91cd380\u514b\uff0c\u6240\u4ee52\u5757\u94c1\u5757\u548c5\u5757\u94dc\u5757\u5171\u91cd380\u00f72=190\uff08\u514b\uff09\u3002\u800c3\u5757\u94c1\u5757\u548c5\u5757\u94dc\u5757\u5171\u91cd210\u514b\uff0c\u6240\u4ee51\u5757\u94c1\u5757\u91cd210-190=20\uff08\u514b\uff09\u30021\u94dc\u5757\u91cd\uff08190-20\u00d72\uff09\u00f75=30\uff08\u514b\uff09\u3002
30.\u7532\u3001\u4e59\u3001\u4e19\u4e09\u4eba\u4e2d\u6709\u4e00\u4eba\u505a\u4e86\u4e00\u4ef6\u597d\u4e8b\u3002\u4ed6\u4eec\u5404\u81ea\u90fd\u8bf4\u4e86\u4e00\u53e5\u8bdd\uff0c\u800c\u5176\u4e2d\u53ea\u6709\u4e00\u53e5\u662f\u771f\u7684\u3002\u7532\u8bf4\uff1a\u201c\u662f\u4e59\u505a\u7684\u3002\u201d \u4e59\u8bf4\uff1a\u201c\u4e0d\u662f\u6211\u505a\u7684\u3002\u201d \u4e19\u8bf4\uff1a\u201c\u4e5f\u4e0d\u662f\u6211\u505a\u7684\u3002\u201d \u95ee\uff1a\u5230\u5e95\u662f\u8c01\u505a\u7684\u597d\u4e8b\uff1f
\u7b54\u6848\uff1a\u5982\u679c\u662f\u7532\u505a\u7684\u597d\u4e8b\uff0c\u90a3\u4e48\u4e59\u3001\u4e19\u7684\u8bdd\u90fd\u662f\u771f\u7684\uff0c\u4e0e\u53ea\u6709\u4e00\u53e5\u662f\u771f\u7684\u77db\u76fe\u3002\u5982\u679c\u662f\u4e59\u505a\u7684\u597d\u4e8b\uff0c\u90a3\u4e48\u7532\u3001\u4e19\u7684\u8bdd\u90fd\u662f\u771f\u7684\uff0c\u4e5f\u4ea7\u751f\u77db\u76fe\u3002\u597d\u4e8b\u662f\u4e19\u505a\u7684\uff0c\u8fd9\u65f6\u7532\u3001\u4e19\u7684\u8bdd\u90fd\u662f\u9519\u7684\uff0c\u53ea\u6709\u4e59\u7684\u8bdd\u662f\u771f\u7684\uff0c\u6240\u4ee5\u597d\u4e8b\u662f\u4e19\u505a\u7684\u3002
31.\u4e00\u5f20\u957f8\u5206\u7c73\u3001\u5bbd3\u5206\u7c73\u7684\u957f\u65b9\u5f62\u7eb8\u677f\uff0c\u5728\u56db\u4e2a\u89d2\u843d\u4e0a\u5404\u622a\u53bb\u4e00\u4e2a\u8fb9\u957f\u4e3a2\u5206\u7c73\u7684\u6b63\u65b9\u5f62\uff0c\u6240\u5269\u4e0b\u7684\u90e8\u5206\u7684\u5468\u957f\u662f\u591a\u5c11\uff1f
\u7b54\uff1a\uff088+3\uff09\u00d72=22\uff08\u5206\u7c73\uff09
32.\u8ba1\u7b97 \uff1a18+19+20+21+22+23
\u539f\u5f0f=\uff0818+23\uff09\u00d76\u00f72=123
33.\u8ba1\u7b97 \uff1a100+102+104+106+108+110+112+114
\u539f\u5f0f=(100+114) \u00d78\u00f72=856
34.995+996+997+998+999
\u539f\u5f0f=(995+999) \u00d75\u00f72=4985
35.\uff1a\uff081999+1997+1995+\u2026+13+11\uff09-\uff0812+14+16+\u2026+1996+1998\uff09
\u7b2c\u4e00\u4e2a\u62ec\u53f7\u5185\u7684\u9879\u6570\u4e3a\uff081999-11\uff09\u00f72+1=995\uff0c\u6240\u4ee5\u539f\u5f0f=(1999-1998)+(1997-1996)+\u2026+\uff0813-12\uff09+11=1\u00d7994+11=1005
\u91c7\u7eb3\u54e6
\u5927\u8857\u4e0a\u539f\u6709\u8def\u706f121\u76cf\uff0c\u76f8\u90bb\u4e24\u76cf\u8def\u706f\u76f8\u8ddd40\u7c73\uff1b\u4e3a\u7f8e\u5316\u8857\u9053\uff0c\u5c06\u8001\u8def\u706f\u5168\u90e8\u6539\u6362\u6210\u65b0\u5f0f\u8def\u706f51\u76cf\uff0c\u6c42\u76f8\u90bb\u4e24\u76cf\u65b0\u8def\u706f\u4e4b\u95f4\u7684\u8ddd\u79bb\u662f\u591a\u5c11\u7c73\uff1f
绛旓細鍒嗘瀽锛氱敱棰樻剰鍙煡锛岄挓闈㈡槸涓涓渾锛屽凡鐭ュ渾鐨勭洿寰勬眰鍦嗙殑闈㈢Н锛屾牴鎹渾鐨勯潰绉叕寮忥細s=蟺r2锛屾椂閽堥暱2.7绫筹紝姹傛椂閽堢粫涓鍦堟椂閽堝皷绔蛋杩囬斿緞鐨勯暱搴︽槸澶氬皯绫筹紝鏍规嵁鍦嗙殑鍛ㄩ暱鍏紡锛歝=2蟺r锛屾妸鏁版嵁鍒嗗埆浠ｅ叆鍏紡瑙ｇ瓟鍗冲彲.瑙ｇ瓟锛氶挓闈㈢殑闈㈢Н鏄锛3.14脳(5.8梅2)2锛=3.14脳2.92锛=3.14脳8.41锛屸増26.4(...
绛旓細绗簲绔宸ф眰鍛ㄩ暱(A)涓銆佸～绌1.涓嬪浘鏄竴鍧楀皬楹﹀湴,宸茬煡鏉′欢濡傚浘涓墍绀.杩欏潡鍦扮殑鍛ㄩ暱鏄背.2.涓嬪浘鈥滃崄鈥濆瓧鐨勬í涓庣珫閮介暱6鍘樼背.闂滃崄鈥濋棿鐨勫懆闀挎槸鍘樼背.3.姹備笅鍥句笂鈥滃嚬鈥濆舰鐨勫懆闀.鍗曚綅:鍘樼背4.涓嬪浘鏄敱鑻ュ共涓浉绛夌殑姝ｆ柟褰㈢粍鎴愮殑鈥滃湡灞扁濅袱涓瓧,宸茬煡姣忎釜姝ｆ柟褰㈢殑杈归暱鏄3鍘樼背,杩欎袱涓瓧鐨勫懆闀垮垎鍒槸...
绛旓細瑙ｏ細(1)灏嗗浘涓彸涓婄己瑙掑鐨勭嚎娈靛垎鍒悜涓娿佸悜鍙冲钩琛岀Щ鍔ㄥ埌铏氱嚎澶(瑙佸乏涓嬪浘)锛岃繖鏍锋濂界Щ琛ユ垚涓涓鏂瑰舰锛屾墍浠ュ畠鐨鍛ㄩ暱涓25脳4=100(鍘樼背)銆(2)涓(1)绫讳技锛屽彲浠ョЩ琛ユ垚涓涓暱鏂瑰舰锛屽懆闀夸负 (10+15)脳2=50(鍘樼背)銆
绛旓細PARTtwo02渚嬮绮捐渚嬮绮捐鐚叓鎴掔殑绡辩瑔鍥存垚濡備笅鍥炬墍绀猴紝杩欓亾绡辩瑔鎬婚暱澶氬皯绫筹紵8绫12绫冲彉寮缁冧範涓嬪浘鏄竴涓ゼ姊殑渚ч潰鍥撅紝姹傛鍥惧舰鐨鍛ㄩ暱銆2绫3绫充緥棰樼簿璁叉湁5寮犲悓鏍峰ぇ灏忕殑绾稿涓嬪浘锛坅锛夐噸鍙犵潃锛屾瘡寮犵焊閮芥槸杈归暱6鍘樼背鐨勬鏂瑰舰锛岄噸鍙犵殑閮ㄥ垎涓鸿竟闀跨殑涓鍗婏紝姹傞噸鍙犲悗鍥惧舰鐨勫懆闀裤備緥棰樼簿璁叉湁5寮犲悓鏍峰ぇ灏忕殑...
绛旓細濡傛灉宸辩煡鍏朵腑涓変釜,灏卞彲姹傚嚭绗洓涓;姹傚拰鍏紡涓秹鍙婂洓涓噺,濡傛灉宸辩煡鍏朵腑涓変釜,灏卞彲浠ユ眰杩欑鍥涗釜銆 鍩烘湰鍏紡:閫氶」鍏紡:an = a1+(n-1)d; 閫氶」=棣栭」+(椤规暟涓1) 脳鍏樊; 鏁板垪鍜屽叕寮:sn,= (a1+ an)脳n梅2; 鏁板垪鍜=(棣栭」+鏈」)脳椤规暟梅2; 椤规暟鍏紡:n= (an+ a1)梅d+1; 椤规暟=(鏈」-...
绛旓細灏嗕竴涓鏂瑰舰鍒嗘垚涓や釜闀挎柟褰紝鍛ㄩ暱鎬诲拰姣斿師鏉ュ浜12鍒嗙背锛屽垯姝ｆ柟褰㈢殑杈归暱绛変簬12鍒嗙背锛屾鏂瑰舰鐨勫懆闀挎槸12x4=48鍒嗙背銆
绛旓細15.灏忔槑銆佸皬鍗庢崏瀹岄奔銆傚皬鏄庤锛氣滃鏋滀綘鎶婁綘鎹夌殑楸肩粰鎴1鏉★紝鎴戠殑楸煎氨鏄綘鐨2鍊嶃傚鏋滄垜缁欎綘1鏉★紝鍜变滑灏变竴鏍峰浜嗐傗滆绠楀嚭涓や釜鍚勬崏浜嗗灏戞潯楸笺傚皬鏄庢瘮灏忓崕澶1脳2=2锛堟潯锛夈傚鏋滃皬鍗庣粰灏忔槑1鏉￠奔锛岄偅涔堝皬鏄庢瘮灏忓崕澶2+1脳2=4锛堟潯锛夛紝杩欐椂灏忓崕鏈夐奔4梅锛2-1锛=4锛堟潯锛夈傚師鏉ュ皬鍗庢湁楸4+1...
绛旓細31.涓寮犻暱8鍒嗙背銆佸3鍒嗙背鐨勯暱鏂瑰舰绾告澘,鍦ㄥ洓涓钀戒笂鍚勬埅鍘讳竴涓竟闀夸负2鍒嗙背鐨勬鏂瑰舰,鎵鍓╀笅鐨勯儴鍒嗙殑鍛ㄩ暱鏄灏?绛:(8+3)脳2=22(鍒嗙背)32.璁＄畻 :18+19+20+21+22+23鍘熷紡=(18+23)脳6梅2=12333.璁＄畻 :100+102+104+106+108+110+112+114鍘熷紡=(100+114) 脳8梅2=85634.995+996+997+998+999鍘熷紡...
绛旓細灏忓涓夊勾绾涓嬪唽濂ユ暟搴旂敤棰樼瘒涓 1銆佺敳銆佷箼涓や汉鍦ˋ銆丅涓ゅ湴鍚屾椂鐩稿悜鍑哄彂锛4灏忔椂鍚庡湪涓棿8鍏噷澶勭浉閬囷紝鐢茬殑閫熷害鏄瘡灏忔椂8鍏噷锛屾眰涔欑殑閫熷害锛2銆佺敳銆佷箼涓や汉鍦ㄥ渾褰㈡睜鍛ㄥ洿缁冪珵璧帮紝姘存睜鍛ㄩ暱7200鍏昂锛岀敳涔欎互姣忓垎閽180鍏昂銆120鍏昂鐨勯熷害鍚屾椂鍑哄彂锛屽嚑鍒嗛挓鍚庡埄娑︾浉閬囷紵3銆佸埄娑﹂獞鑷杞︿粠鍚屼竴鍦扮偣鍑哄彂锛屾部鍛ㄩ暱900...
