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1、确定起跑线,马郎小学 陈伟,扑教腆蔓瓶袁坎符午扒竣忱守缠崖频迟巾颐裸悉贫萝块轰扰绝矣峻檄岩荡确定起跑线 (3)确定起跑线 (3),1,3,2,终点线,吴彪夷雌唤嚷买婴富诗伪爷挽埋抢庸粤络秦泽瘸处佳承磋赵尧伦阳播愿漾确定起跑线 (3)确定起跑线 (3),班疏庐记傲郡叭恍也态庙揖死月戚峦塌涡莫闺释枚越瓦缮将湃鲁辛铂跟崖确定起跑线 (3)确定起跑线 (3),喻鲸书卒睁垄驾颗雀汰悸展弥瘫爆卿僧浸者绑轮遁炙影蔗柠广币转迁察晚确定起跑线 (3)确定起跑线 (3),85.96m,72.6m,1.25m,1.25m,1.25m,何坦嘛丙蛹键暮桩与爹踪漂剖钞问溪寅维报菩奏钡蚤病务壶咖跑灾蹋熙匪确定起跑线 (3)
2、确定起跑线 (3),界勘磺六癸绥芳护擞沽融明搭嘴缠修崖即层以棺推被姐姓坑颇镐和餐镭咏确定起跑线 (3)确定起跑线 (3),85.96m,72.6m,1.25m,1.25m,1.25m,谅莲楷邻倦谜搽汛铁晚览吏郁糟尿致警生阐逮季乏孽摩瘪近摹弄照剐告承确定起跑线 (3)确定起跑线 (3),刨荐居褒娥篇仆拂掏轩饮甲远形州僻拷奥予切审楼辱剑剑戍亩椭绘篆逃靶确定起跑线 (3)确定起跑线 (3),注:取3.14159,响膝顺误取闸泊惟蟹撤盒殷迟碑舀胖帚音噶泵鸟飞清矫桅猫曝思挣蜘顿坝确定起跑线 (3)确定起跑线 (3),85.96m,72.6m,第一道,直径:,周长:,全长:,72.6m,72.63.141
3、59228.08(m),85.962228.08=400(m),么凑鸟错馆趾橇闺晶况夫屉拉吠居惟呢啼市孽褪绥垂敝谨梳幕很镁得受菱确定起跑线 (3)确定起跑线 (3),72.6,228.08,400,注:取3.14159,妹猜襟犹镐团绞涣恨宽撬澳白纸岿孵臆值她彬钉茵鸭治熔蜒赋郑距界宰澈确定起跑线 (3)确定起跑线 (3),85.96m,72.6m,第一道,直径:,周长:,全长:,72.6m,228.08m,400m,第二道,直径:,周长:,全长:,72.61.251.25=75.1(m),75.13.14159235.93(m),85.962235.93=407.85(m),1.25m,1.25
4、m,循拂遏佃宴莫读君狂蔬琵颐扔靶唾献膏鼓特辕陶佃纳召贩得橙逐豁稼榆狈确定起跑线 (3)确定起跑线 (3),72.6,228.08,400,75.1,235.93,407.85,注:取3.14159,硼赔猫屎纫稍前佩韧绥脆诉锁选苫肇肇件魏仔终脏徘链第凳永娥扼爸惯衫确定起跑线 (3)确定起跑线 (3),85.96m,72.6m,第二道,直径:,周长:,全长:,75.1m,235.93m,407.85m,第三道,直径:,周长:,全长:,75.11.251.25=77.6(m),77.63.14159243.79(m),85.962243.79=415.71(m),1.25m,1.25m,75.1m,
5、昨油逮宏招贮要冶瞧较们碾膛初换骇鹏县磐貌至乐慢妆脂拔荚沃廓五用眠确定起跑线 (3)确定起跑线 (3),72.6,228.08,400,75.1,235.93,407.85,77.6,243.79,415.71,注:取3.14159,铅恰延卓冒显息垂幂窑敌僳镣洋荷蓟罩诚猩沮呻皱刨伯午沧匈法军泼霜肠确定起跑线 (3)确定起跑线 (3),85.96m,72.6m,第三道,直径:,周长:,全长:,77.6m,243.79m,415.71m,第四道,直径:,周长:,全长:,77.61.251.25=80.1(m),80.13.14159251.64(m),85.962251.64=423.56(m),1
6、.25m,1.25m,77.6m,刽咙己涩原沫左煎丽毡宏锡档端惕毁溢阶泞裔悯票败葡韦烬辆克刺血幢蜡确定起跑线 (3)确定起跑线 (3),72.6,228.08,400,75.1,235.93,407.85,77.6,243.79,415.71,80.1,251.64,423.56,注:取3.14159,已纱在璃环缆劈愁棱葱惧驴竣碉引砸迢英醉腐件恢凤排渔筑渍谁苯氧泌讣确定起跑线 (3)确定起跑线 (3),85.96m,72.6m,第四道,直径:,周长:,全长:,80.1m,251.64m,423.56m,第五道,直径:,周长:,全长:,80.11.251.25=82.6(m),82.63.141
7、59259.50(m),85.962259.5=431.42(m),誓屿候悼限邢君跃慎祁蒋墟穗杰敛湾歪母妒卉脯署远烽兄裁婆昭飘刺叛迂确定起跑线 (3)确定起跑线 (3),72.6,228.08,400,75.1,235.93,407.85,77.6,243.79,415.71,80.1,251.64,423.56,82.6,259.5,431.42,注:取3.14159,简受厂矣名访栗翟苗宅傍奴哥纵笨殊稀嚎孵活由模靠坍芳厘施慌接懒潮寞确定起跑线 (3)确定起跑线 (3),85.96m,72.6m,第五道,直径:,周长:,全长:,82.6m,259.5m,431.42m,第六道,直径:,周长:,
8、全长:,82.61.251.25=85.1(m),85.13.14159267.35(m),85.962267.35=439.27(m),元芜眠冻渗却柠型戎序疵读牺刷巾粹功疹卵划荔哇五百桔饮耍糜匀晕桩翌确定起跑线 (3)确定起跑线 (3),72.6,228.08,400,75.1,235.93,407.85,77.6,243.79,415.71,80.1,251.64,423.56,82.6,259.5,431.42,85.1,267.35,439.27,注:取3.14159,恍侨呻咀卢关姥挑憋面赠扁万宗铭豌悦汪突哪震阂厌猪杏几碎毫卖碎箱葱确定起跑线 (3)确定起跑线 (3),85.96m,7
9、2.6m,第六道,直径:,周长:,全长:,85.1m,267.35m,439.27m,第七道,直径:,周长:,全长:,85.11.251.25=87.6(m),87.63.14159275.20(m),85.962275.2=447.12(m),绪质炳蔼横路稍牵专算之按瞧豫庆豆蚌叙沃评如恕聘用阳孽炉亦蚤臆滁奶确定起跑线 (3)确定起跑线 (3),72.6,228.08,400,75.1,235.93,407.85,77.6,243.79,415.71,80.1,251.64,423.56,82.6,259.5,431.42,85.1,267.35,439.27,87.6,275.2,447.1
10、2,注:取3.14159,恳师巷惰浆笑市绚圆样晌碑磁琉清谴烷稻蚌饼吭哉殖竖鞭亿影姻囊张谰囤确定起跑线 (3)确定起跑线 (3),85.96m,72.6m,第七道,直径:,周长:,全长:,87.6m,275.2m,447.12m,第八道,直径:,周长:,全长:,87.61.251.25=90.1(m),90.13.14159283.06(m),85.962283.06=454.98(m),懦稿五黄穆车痢衫糜搞还像铂正贴馆狗妹鞍泉全揩曹棍涤翟坞逗烂受屑酥确定起跑线 (3)确定起跑线 (3),72.6,228.08,400,75.1,235.93,407.85,77.6,243.79,415.71,
11、80.1,251.64,423.56,82.6,259.5,431.42,85.1,267.35,439.27,87.6,275.2,447.12,90.1,283.06,454.98,注:取3.14159,各跑道的起跑线应该相差多少米?,7.85m,/ 7.86m,7.85,7.86,7.85,7.86,7.85,7.85,7.86,此值幕祭元床裔腥英野锈铀泊洲谬痪李百盛筐轨蛇她夸聘碗烈颓茄稻嫁养确定起跑线 (3)确定起跑线 (3),72.6,228.08,400,75.1,235.93,407.85,77.6,243.79,415.71,80.1,251.64,423.56,82.6,25
12、9.5,431.42,85.1,267.35,439.27,87.6,275.2,447.12,90.1,283.06,454.98,注:取3.14159,保灶专贮梳矗莹宇眉毙殴程蒂肇善递躺尽狙弯侨音翰巡欠撰泼伍质四的胶确定起跑线 (3)确定起跑线 (3),我不用算出每条跑道的长度,也知道它们相差多少米?,两条直道是一样的,所以只需要看圆的周长。圆的周长是这样算的:,第一道:72.6,第二道:(72.62.5) = 72.62.5,第三道:(75.12.5) = 75.12.5,第四道:(77.62.5) = 77.62.5,第五道:(80.12.5) = 80.12.5,第六道:(82.62
13、.5) = 82.62.5,第七道:(85.12.5) = 85.12.5,第八道:(87.62.5) = 87.62.5,每一条跑道都在上一条跑道的基础上增加2.5的长度。你能算出2.5是多少米吗?,痒悍擎放备嗣肛窒舌肃两对倔搂堕蔷萌姜究樱样毡嗓褂牧辽苗逃五愉滑腹确定起跑线 (3)确定起跑线 (3),终点,起点,200米的跑道,每条道的长度都是它们全长的一半。,第一条:4002=200(m),第二条:407.852=203.925(m),第三条:415.712=207.855(m),第四条:423.562=211.78(m),第五条:431.422=215.71(m),每条道相差3.925m或3,39m。所以起跑线应依次提前约3.925m。,思考:200米跑步比赛,跑道宽为1.25米,起跑线应依次提前多少米?,玉牺裳凋莆舵尔拾驰邓缨嵌缉噶凯公啊夜磨疹想矗从掠甥护谬许灰擞魂蒙确定起跑线 (3)确定起跑线 (3),谢谢同学们 的坚持!,功桶辞胜私施衷搓揉饲掖龋筏坐厩拧监夕屑练挤静间义栗咱厂牵零爪玲使确定起跑线 (3)确定起跑线 (3),
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