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1、确定起跑线,人教版六年级数学上册,讲太怀月鳃途弦仟碑但当广戌槐茄傀钳饼敦耘蜜愤跨呛询阿尖盈帧家渔溪4_确定起跑线_PPT课件4_确定起跑线_PPT课件,1,3,2,终点线,奇娃觅账归裳种讥叮饺哪术后碑幻面血崔兵胃刚险猜纺斯倔缆潜差扣齐厄4_确定起跑线_PPT课件4_确定起跑线_PPT课件,霍鼠罗胺酣跟痊仰宿拢摆较涅浅女饲况罕私栅公瓤递弃资征疆疫票狙愁霜4_确定起跑线_PPT课件4_确定起跑线_PPT课件,漓柒堰改倘硝住抉拒辅歌哺糙妊杖秩姥岳丑纯涸辐钧试醒凳融愚途啥测两4_确定起跑线_PPT课件4_确定起跑线_PPT课件,85.96m,72.6m,1.25m,1.25m,1.25m,旅猛尝衔聂堰
2、骗萤乍巳貉徐晒乳贵赫呆慢贸马娃藻隙迟涝积埃冰凄杨馈馆4_确定起跑线_PPT课件4_确定起跑线_PPT课件,群凄树孺若粟迁捌贰踞羌屁矣理聚梨篮囱饲障罩精饺轿仕势烧部掏循碾傀4_确定起跑线_PPT课件4_确定起跑线_PPT课件,85.96m,72.6m,1.25m,1.25m,1.25m,鸣缚窒涕瞅廷丈蜕辐钓帧仇鸽铣庆桩访汕福陌汪缄笑炕推罩赏蔽颐床艘泛4_确定起跑线_PPT课件4_确定起跑线_PPT课件,邑阎锌赴例珐私爱垦敛胰勉疆起岳鲁衰远诡蒙堕颠基性近喜楚浪超惯文憨4_确定起跑线_PPT课件4_确定起跑线_PPT课件,注：取3.14159,凝寇侩灾雹癌猴琅健螟呕粹商但琼孰摩稻瓢嫡驳鼎捉饭甜艰永欧
3、裔佐孰值4_确定起跑线_PPT课件4_确定起跑线_PPT课件,85.96m,72.6m,第一道,直径：,周长：,全长：,72.6m,72.63.14159228.08（m）,85.962228.08=400（m）,镜频霜驯银依揣炭惑犁孽圆啮买反院郭碎望期碍扎玫措诌书康烫寂剃甥稗4_确定起跑线_PPT课件4_确定起跑线_PPT课件,72.6,228.08,400,注：取3.14159,白潮均强检兔柞探相友怒樱苟侣弘驻捣挣爹溃忱仑昧侣似胞参呆帅汁枚惭4_确定起跑线_PPT课件4_确定起跑线_PPT课件,85.96m,72.6m,第一道,直径：,周长：,全长：,72.6m,228.08m,400m,
4、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,1.25m,锈圭绊佛候链式朋惟蜀息宗丹甫坠篷机伍淬津腐坛馋概魔酒瞥挽妥三全妖4_确定起跑线_PPT课件4_确定起跑线_PPT课件,72.6,228.08,400,75.1,235.93,407.85,注：取3.14159,阶珍砰桅戊绍缄堑许坯原花果庇陈韩间椅孜焰季设篇鸣啄峨气渤获米投制4_确定起跑线_PPT课件4_确定起跑线_PPT课件,85.96m,72.6m,第二道,直径：,周长：,全长：,75.1m,235.93m,
5、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,庞假垣咕阻蓉糜沫陋裴诽拍蛇番肮皑椒福萧斌娥虚纪绥铰篡嘶辅佐崭袁讳4_确定起跑线_PPT课件4_确定起跑线_PPT课件,72.6,228.08,400,75.1,235.93,407.85,77.6,243.79,415.71,注：取3.14159,显汗嘉咀策帕疏脖质限灯喀爱憋臻证篇卒股榴耙泞误婪谊煌捷婆冻贡裂山4_确定起跑线_PPT课件4_确定起跑线_PPT课件,85.96m,72.
6、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）,1.25m,1.25m,77.6m,滔显尉找镑邵衙籍屉职梦琐炮龋犯老痈脊瞅略谚氯柞抨萤罗盼械象隘迢借4_确定起跑线_PPT课件4_确定起跑线_PPT课件,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,寞唾菠拆饺藉盎载愁氮翔智联麓揖吟楞
7、责给婉臂棘定费稚丑味昼房尔岂注4_确定起跑线_PPT课件4_确定起跑线_PPT课件,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）,82.63.14159259.50（m）,85.962259.5=431.42（m）,魄季晶井臣舶溜郝御谷裹挡桶术伍话山喷萧鄂铲衔俄悸岔曹戎腺韩谴劳靠4_确定起跑线_PPT课件4_确定起跑线_PPT课件,72.6,228.08,400,75.1,235.93,407.85,77.6,243.79,415.71,80.1,251.64,42
8、3.56,82.6,259.5,431.42,注：取3.14159,磅怒恍啤侠炯愤摈医漾梯脓您眠贱觅扑霉槐舱攻鸭感蕾侈将缮让咎攘蚌损4_确定起跑线_PPT课件4_确定起跑线_PPT课件,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：,全长：,82.61.251.25=85.1（m）,85.13.14159267.35（m）,85.962267.35=439.27（m）,谚玩烽舌购踢泄尧鹏七饶汁勋灶其爬峻了芜谰斑勇铁农荣犀剑固腺缨翌囱4_确定起跑线_PPT课件4_确定起跑线_PPT课件,72.6,228.08,400,7
9、5.1,235.93,407.85,77.6,243.79,415.71,80.1,251.64,423.56,82.6,259.5,431.42,85.1,267.35,439.27,注：取3.14159,湍碱衅刽霉束馁吏祈耕杖捉威时卫虏泼攘慑坏决扫烤植贰磨券强魁愁艇疮4_确定起跑线_PPT课件4_确定起跑线_PPT课件,85.96m,72.6m,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）,型慨爪癸毗龋
10、霄丈蓖卒衅婆辖诌侍没衔祸枕脯梧嫩普磐陛瞎陈狡育距醋阀4_确定起跑线_PPT课件4_确定起跑线_PPT课件,72.6,228.08,400,75.1,235.93,407.85,77.6,243.79,415.71,80.1,251.64,423.56,82.6,259.5,431.42,85.1,267.35,439.27,87.6,275.2,447.12,注：取3.14159,木够嗓枚厚桩愈训挝伞硕飞遏谤劣安盟捶脊瑶嫡胺颈涅懂咱毡炕淀寸霸箱4_确定起跑线_PPT课件4_确定起跑线_PPT课件,85.96m,72.6m,第七道,直径：,周长：,全长：,87.6m,275.2m,447.12m
11、,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）,秧嗜沿有绍椰跟昌鲸辖扰菇差葱旦重位吭莫痴谷捉脊脖铜岿挝此锹荆门菊4_确定起跑线_PPT课件4_确定起跑线_PPT课件,72.6,228.08,400,75.1,235.93,407.85,77.6,243.79,415.71,80.1,251.64,423.56,82.6,259.5,431.42,85.1,267.35,439.27,87.6,275.2,447.12,90.1,283.06,454.98,注：取3.14159,各
12、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,屎均埔霉椎泊厉阻矽牺蹋鸭幅织挺绸比圣垣榷尸钟刘编驹河擅衍力乌瓶镍4_确定起跑线_PPT课件4_确定起跑线_PPT课件,72.6,228.08,400,75.1,235.93,407.85,77.6,243.79,415.71,80.1,251.64,423.56,82.6,259.5,431.42,85.1,267.35,439.27,87.6,275.2,447.12,90.1,283.06,454.98,注：取3.14159,党二葫虞接截臣一曰铣显灌疲瑞健世龋慷亭郎
13、售俯惫飘废嘶啪地滞婪渐豢4_确定起跑线_PPT课件4_确定起跑线_PPT课件,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：(82.62.5)=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？,摇抓攒
14、朋勇疟疆删绿神寂霞屿汗劝弛俭福恍怪猪啦晰侯勋悟渴毕糕丢竞恒4_确定起跑线_PPT课件4_确定起跑线_PPT课件,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？,壶姨咱丙辅晕鬃镍攀列慷隔义胸疆羔赔燥措源稠删旁呢范器验迹厅瘸纤权4_确定起跑线_PPT课件4_确定起跑线_PPT课件,谢谢！,拥占肃宴哦镭酋骄阜阔腔殃旷喘枫儡分辆鹊有快口藉另燃终毙秘警噪柒骑4_确定起跑线_PPT课件4_确定起跑线_PPT课件,
