拿一个绳子围两个圆假如那个绳子是2.01厘米那么这个绳子至少要用多少米保留十？ 一根绳子长9.42米。用这根绳子围成一个圆，直径最长是多少米...
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9.42\u00f73.14=3\u7c73
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绛旓細涓鏍鍎缁冲瓙鍥翠袱涓渾鍎匡紝鍋囧閭ｄ釜缁冲瓙鏄2.01cm锛岄偅涔堣繖涓怀瀛愯嚦灏戦渶瑕5cm銆
绛旓細1. 浜ゅ弶濂楁硶锛氬皢涓や釜鍦嗗湀缁冲瓙浜掔浉浜ゅ弶濂楀湪涓璧凤紝鐒跺悗鎷夌揣鍥哄畾銆傝繖绉嶆柟娉曚笉澶熺墷鍥猴紝瀹规槗鏉捐劚銆2. 缁崇粨濂楁硶锛氬湪涓涓渾鍦堢怀瀛愮殑涓績鎵撲竴涓皬缁崇粨锛屽啀灏嗗彟涓涓渾鍦堢怀瀛愮┛杩囪繖涓怀缁擄紝鏈鍚庡皢涓ゆ潯缁冲瓙鍚勮嚜鍥哄畾銆傝繖绉嶆柟娉曡緝涓虹墷鍥猴紝浣嗛渶瑕佸厛鎵撶怀缁撱3. 铻烘棆濂楁硶锛氬皢涓涓渾鍦堢怀瀛愭壄鎴愯灪鏃嬬姸锛岀劧鍚庡皢鍙︿竴...
绛旓細绁炲鐨勯瓟姣旀柉鐜紝绋嶇瓑缁欎綘鍙戣繃绋
绛旓細瑕佺煡閬撳悓鏍峰懆闀跨殑鍥惧舰锛屽渾鐨勯潰绉渶澶...鍏蜂綋濡備笅锛18.84/4=4.71cm 锛堣繖涓烘鏂瑰舰杈归暱锛夛紝18.84/2=9.42cm锛堜竴涓渾鐨勫懆闀匡級9.42/3.14=3cm锛堜竴涓渾鐨勭洿寰勶級鍥犱负涓や釜鍦涓嶉噸鍙犳儏鍐典笅鍚屾椂鏀捐繘姝ｆ柟褰㈤噷鏈変袱涓洿寰勯暱锛屾墍浠3脳2=6cm锛岃6cm姣4.71cm澶э紝鎵浠ヤ笉鑳藉悓鏃舵斁杩涘幓......
绛旓細浣跨敤婊戣疆鐨勬柟寮忥紝鐢ㄤ竴涓紶鍔ㄦ粦杞傝繛鎺ヨ鎷夊姩缁冲瓙鐨勬粦杞崐寰勪负杩炴帴鎷夊姩缁冲瓙婊戣疆鐨3鍊嶃傛牴鎹粦杞殑鍛ㄩ暱鍏紡C绛変簬2娲緍銆傚緱鐭ョ怀瀛愮殑浼犲姩闀垮害涓庝紶鍔ㄨ疆鐨勫崐寰勬垚姝ｆ瘮銆
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绛旓細1銆侀鍏堟妸缁冲瓙澶撮噷缁冲瓙鎸夌収闃舵鐘跺幓闄や竴閮ㄥ垎锛屼娇缁冲ご鍙樼粏銆2銆佸叾娆″皢缁冲ご绌胯繃閭ｄ釜瀛斿悗锛屾參鎱㈠線澶栨媺缁冲瓙锛屽鏋滀笉濂芥媺锛屽彲浠ュ湪缁冲瓙涓婃秱涓婅偉鐨傘3銆佹渶鍚庡皢缁冲瓙鎷夊埌搴曞嵆鍙┛杩囧渾鐜
绛旓細绛旀3:2 绗涓涓渾2蟺R=24 绗浜屼釜鍥2蟺r=16 鍒櫹R=12锛屜r=8 R锛歳=3:2
绛旓細鍙堣繖鏍缁冲瓙闀94.2绫筹紝鍗冲ぇ灏涓や釜鍦鐨勫懆闀垮拰鏄94.2绫 鍙垪鍑哄紡瀛愶細2蟺r+2蟺(4r)=94.2锛屽嵆锛10蟺r=94.2锛屜绾︾瓑浜3.14锛屽甫鍏ュ紡涓紝瑙ｅ緱锛歳=94.2梅10梅3.14=3绫 鎵浠ュ皬鍦嗗崐寰勬槸3绫筹紝鍒欏ぇ鍦嗗崐寰勬槸12绫 灏忓渾鐨勯潰绉=蟺r^2=3.14脳3^2=3.14脳9=28.26骞虫柟绫 澶у渾鐨勯潰绉=蟺(4r...
绛旓細灏辨槸涓ょ濡傚浘锛岀劧鍚庢妸鐞冩斁杩涘幓锛屽湪涓ょ瀵硅鍐嶇┛杩囦笂闈㈠氨寰椾簡
