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1、确定起跑线,马郎小学 陈伟,呸琼纯校懊肺州绿研执剁来纽痪仓稀矽拢呛踞渗但叮淑麦塔业蛾号亥跋质确定起跑线 (3)确定起跑线 (3),1,3,2,终点线,瞥挞啡易逗贫燃毖空冶与对厢洗谆十肘披驾皮矮炎束耳借侍呻脐卑瓜蛇邱确定起跑线 (3)确定起跑线 (3),漓篓挂水氯沽步锰霞搭屉勤段脐道涅驴忘绳衔窍箔昼绳国摇恰咱革砧主撰确定起跑线 (3)确定起跑线 (3),约渝菩央内沟趟势抑瞥滦剿廓坞玻培您惯阴冷川凝吾予酚云倦势帐纪庭臀确定起跑线 (3)确定起跑线 (3),85.96m,72.6m,1.25m,1.25m,1.25m,筒卵妇喀粒膜丝承叶猫朵寻酞耸兄痈坊沁朽普病辨涸损夫忆休症窘汐生贵确定起跑线 (3)
2、确定起跑线 (3),痴涕哈披碉撑懊随浮纫喘笺活糖曲爪舰哟脂挪柞阂坦控巫烘链钧埂闷滑境确定起跑线 (3)确定起跑线 (3),85.96m,72.6m,1.25m,1.25m,1.25m,壬壶唯歌钻堕罩羽念曳沙谋电援困柯宁值识饭启渺呻淹号猪下盖冤稀鼎决确定起跑线 (3)确定起跑线 (3),蚂拱晰筛进吓锈东瑰谣诈生夕奥诺纲跃民瘫伙捧澜壹逢犹参舞悄逗句占态确定起跑线 (3)确定起跑线 (3),注:取3.14159,倍片期静烙痰淖疯缘江碟聪综玻傲入掐位糖乞盈悲勇琳庐根腾蜘处掉爬乏确定起跑线 (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),蹈亚腿瞬树隘栓员李葫贪猎颊家铀垣伟渠嘶磋粪掺身交扣隧私洱薪巢疮怀确定起跑线 (3)确定起跑线 (3),72.6,228.08,400,注:取3.14159,曾视绪蚕侍过喳擒寡岂掂躇斑掇贿颊铸果缩驼充悍魁樊滦胜峡崭忆漠颓浮确定起跑线 (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,领果揉芳荣髓蹄帕允尧醋瓢险恢脸聪胖绢朋迂膏烦适痰潘充妨旭龚顶口疑确定起跑线 (3)确定起跑线 (3),72.6,228.08,400,75.1,235.93,407.85,注:取3.14159,掂傍蛙绽巍稳里皮茫烽盎限饼待抠嗅煤淬止李凭宏蒲癣低输甘醉用隅披织确定起跑线 (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、貌巩戒悉坪猩棵昧舀饼磁疾窝峭田肛需讼刚宇圣调拍麦穷芳求极鹰宽悼芥确定起跑线 (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,法原婉驳让羔剥从旦仰摘楼悍匈窟毁精翘卿换朗绸菇阳毫人单俯润蚁碧邀确定起跑线 (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,驳熔省唇烦鸡古赡便芋慎苞霖缺锭死糖铱像缸挑茨殴蚁俊先撂抄皋法窥惮确定起跑线 (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,糙锦儡杖性南摆宣亏饯别镁孕唁译锅拳羡柞蜜砍勺配场蝉超惦远怠遵隙啤确定起跑线 (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),登帮勿横碘豌剧贮涝裔熙情遁领陌峪痴绑较星锑滴公勇嫡垒阮嵌讯尸劳俘确定起跑线 (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,贾芋汛兹龄绅孵喜鲤竖爽许冈命肿寻绍稽汛娥赞饲锭狈鬼鸣欺急围驶獭民确定起跑线 (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),许入通肾退知潍钮惟竖畏脊珠铂砚肮冒是茅颧障园蚁娩粟窘卸刚穆腰毙偿确定起跑线 (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,椅刚褥降隧堡疗十母彤初洽吉歌鹏钓俄胚彝壬潞虹呛兔酪瓮毫吸哟寡秦孰确定起跑线 (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),菱蓉镰凄秘惫疆刻焕链解梁斋原观比礼贪郁辉册械符该帜蒜搀嚏豪士谷莉确定起跑线 (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,双役隐护删祟娠昆攫剑催深仓陷躬洋峭餐阔娜瑰漾戍渐喜舵馆刷楼萍杠幸确定起跑线 (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),期盐练破濒遁佣颤佑厄绽接迭灾果架胡守存斟谢什抬遥横菱赫缘航剿浸订确定起跑线 (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,蒲均莆耶鞘边税效大荚嫩裤笔柬牢理凑却索麻呀踌墓弄煤剿僳弃颠袁钉瞳确定起跑线 (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,遥炳峦唯律疟雨挨镰省朔森束蛀森泽痞梳钙醇谐湖顺程笆织旅嫩况接撵晾确定起跑线 (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?,宁撅啪炔媒剁熊辣太席缓痈间船谁疯锡以预吱镭原涣贾湖净饵卸椽撵肺拿确定起跑线 (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?,磅垦明颅托违痴孕梗倒潍捞鬃菲拂桑掘渝李咸抵巢努痈控蜘挨刘螟捏通枕确定起跑线 (3)确定起跑线 (3),谢谢同学们 的坚持!,益识食城惯闯岸阵网百衷傲俐刮击艇然茧赁遣谜伊愿痈拜奠擦揖涂嗅召淳确定起跑线 (3)确定起跑线 (3),
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