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西江中学·白明·教学设计《确定圆的条件》

来源:秒速赛车_秒速赛车官网下载-全球十大平台 发布时间: 2020-05-09 10:20:01 浏览次数: 【字体:

yi、xueshengzhishizhuangkuangfenxi

xueshengdezhishijinengjichu

秒速赛车tongguobenzhangqianmianjijiekedexuexi,xueshengzhidaojingguoyidiankeyihuawushutiaozhixian,jingguoliangdianyouqiezhiyouyitiaozhixiandengzhishi.tongshijubeileyongchiguizuo“xianduanchuizhipingfenxian”dengcaozuojineng,zhangwole“xianduanchuizhipingfenxiandexingzhi”.

xueshenghuodongjingyanjichu

zaijingguodianhuazhixiandengzhishidexuexiguochengzhong,xueshengjubeileyidingdehezuojingshenhetanjiunengli,juyouyidingdefenleitaolundeshuxuesixiangfangfaheleibifangfa.

er、jiaoxuerenwufenxi

benjiekedeneirongshidiyijieneirongdeyanxu,xueshengyijileilehuayigeyuandejingyan.jiyuyishangliangdian,tichubenkedejutixuexirenwu: ①jingguoyidian、liangdian、sandiannengfouzuochuyuan、nengzuochujigeyuan.②lejiesanjiaoxingdewaijieyuan、sanjiaoxingdewaixindenggainian,danbenkeneirongcongshuyu“kongjianyutuxing”dejiaoxuemubiao: renshitongguoguancha、shiyan、guina、leibi、tuiduankeyihuodeshuxuecaixiang,tiyanshuxuehuodongchongmantansuoxinghechuangzaoxing,ganshouzhengmingdebiyaoxingjijielundequedingxing.tongshiyeyinglituzaixuexizhongzhubudachengxueshengdeyouguanqinggantaidumubiao.

zhishiyujineng

1. lejiebuzaitongyizhixianshangdesangedianquedingyigeyuan,yijiguobuzaitongyizhixianshangdesangedianzuoyuandefangfa;

秒速赛车2.lejiesanjiaoxingdewaijieyuan、sanjiaoxingdewaixindenggainian.

guochengyufangfa

秒速赛车1.jinglibuzaitongyizhixianshangdesangedianquedingyigeyuandetansuoguocheng,peiyangxueshengdetansuonengli.

秒速赛车2.tongguotansuobuzaitongyizhixianshangdesangedianquedingyigeyuandewenti,jinyibutihuijiejueshuxuewentidecelve.

qinggantaiduyujiazhiguan

xingchengjiejuewentidejibencelve,tiyanjiejuewenticelvededuoyangxing,fazhanshijiannengliyuchuangxinjingshen.

jiaoxuezhongdian: quedingyuandetiaojian.

秒速赛车jiaoxuenandian: quedingyuandetiaojian.

san、jiaoxueguochengfenxi

秒速赛车benjiekeshejileliugejiaoxuehuanjie: keqianzhunbei;qingjingyinru;shijiantanjiu;hezuoxuexilianxitigao;ketangxiaojie;buzhizuoye.

diyihuanjie: keqianzhunbei

huodongneirong: buzhixueshengzaikeqianfuxi,huidaruxiadewenti:

秒速赛车(1)jingguoyidian、liangdian、sandianninengfouhuachuyitiaozhixianma?ruoneng,keyihuachujitiaozhixian?

(2)tongguoyishangwentidehuida,niyoushenmetihui?

(3)yizhixianduanab,qiuzuoxianduanabdezhongchuixian?

huodongmude: tongguowenti(3),xiwangxueshengfuxixianduanzhongchuixiandechiguizuofa,weibenkezuoyuanzuozhishidepudian.tongguowenti(1)(2)defuxihuida,weibenkedetansuo“jingguosandiannengfouquedingyigeyuan”zuoyigetansuocelveshangdepudian,jinyibupeiyanglexueshengfenleitaolundeshuxuesixiang.

shijijiaoxuexiaoguo: zaikaishidetiwenzhong,xueshengduizhongchuixiandechiguizuofa、jingguoyidiankeyihuawushutiaozhixian、jingguoliangdiankeyihuayitiaozhixiandehuidajiaohao,danzaihuida“jingguosandiannengfouhuazhixian”wentishangchuxianfenqi,bufenhuida“bunenghuachuzhixian”huo“keyihuayitiaozhixian”huo“yishangliangzhongqingkuangdouyoukeneng”deng.tongguoduiwentidezhenglun、huida,dadaoleyuqimubiao,peiyanglexueshengxuehuiyurenhezuo,nengyutarenmiaosusaichesiweideguochenghejieguo.

dierhuanjie: qingjingyinru

秒速赛车huodongneirong: xueshengxiaozutaolunruxiawenti: moudiquyikongdishangxinjianlesangejuzhuxiaoqua、b、c.xianyaoguihuayijianxuexiao,shixuexiaodaosangexiaoqudejulixiangdeng,niruhexuanquzheisuoxuexiaodedidian?

秒速赛车huodongmude: ①tongguowentidesikaotaolun,youchengshangqixiadezuoyong,erxianyaojiejuezheisangexiaoqushifouzaiyizhixianshang.②yinqixueshenghuixiangyuandedingyi,dechuzuoyuandeguanjianshidingyuanxin、dingbanjing.③jiezhushijiwentiqingjing,jifaxueshengjiejuewentidexingqu,weijiejuebenjiekedemubiao“quedingyuandetiaojian”hexiahuanjiedetanjiuhuodongzhurudongli.

shijijiaoxuexiaoguo: xueshengzaiyigekuansongdeqifenxiazhankaiduiwentidetanjiu: wentiyingfena、b、csanxiaoquzaitongyizhixianshanghuobuzaitongyizhixianshangliangzhongqingkuang;wentijishizhaochuyigetongshijingguoa、b、csandiandeyuan.(ziranyinchuketi)

disanhuanjie: shijiantanjiu,jiejuewenti

秒速赛车    huodongneirong: canzhaojiaocaitigongdesangewenti:

秒速赛车①zuoyuan,shitajingguoyizhidiana,ninengzuochujigezheiyangdeyuan?weishenmeyouzheiyangduogeyuan?

②zuoyuan,shitajingguoyizhidiana、b,nishiruhezuode?yijushishenme?ninengzuochujigezheiyangdeyuan?qiyuanxinfenbuyoushenmetedian?yuxianduanabyoushenmeguanxi?weishenme?

③zuoyuan,shitajingguobuzaitongyizhixiandeyizhidiana、b、c,nishiruhezuodaode.ninengzuochujigezheiyangdeyuan?weishenme?

④nixianzainengjiejuekeqiandewentilema?dongshouzuoyizuo?

huodongmude: yiwentichuandexingshiyindaoxueshengyouyidaonandikaizhantanjiuhuodong、peiyangxueshengdetanjiujingshen,shixueshengtihuizaizheiyiguochengzhongsuotixiandeguinasixiang,congzhongtanjiuchu:

①buzaitongyizhixianshangdesangedianweishenmezhiquedingyigeyuan?

秒速赛车②zheigeyuanruheyong“chigui”zuochu?

③sanjiaoxingwaijieyuan,sanjiaoxingdewaixindegainiandengwenti,congershixianbenjiekedejiaoxuemubiao,tupozhongdiannandian,shixueshengzhangwoguosandianzuoyuandefangfa.

秒速赛车shijijiaoxuexiaoguo: xueshengduiwenti①、②zhongyouduoshaogefuhetiaojiandeyuannenghenkuaidihuidachulai,danxueshengduiwenti①zhong“weishenme”dehuidakenenghuizhuabuzhuhuayuandebenzhi(dingyuanxin、dingbanjing)laihuida;duiwenti③detanjiuyongshibijiaozhang,zhongyaoyuanyinshibufenxueshengzuolesantiaobiandezhongchuixian,dui“weishenme”dehuidayeweinengzhuazhujiaodiandeweiyixingjibanjingsuizhediandequedingerquedingjinxinghuida.

disihuanjie: lianxitigao

huodongneirong:

秒速赛车(1)wanchengkebensuitanglianxi;

(2)panduanti:

①jingguosandianyidingkeyizuoyuan.                           (           )

②renyiyigesanjiaoxingyouqiezhiyouyigewaijieyuan.        (       )      

③sanjiaoxingdewaixinshisanjiaoxingsanbianzhongxiandejiaodian.        (             )

秒速赛车④sanjiaoxingwaixindaosanjiaoxingsangedingdiandejulixiangdeng.   (              )

(3)rutushiyikuaicanquedeyuanxingmugai,xianyaozhongxinzhizuoyikuaiyuyuanlaiyiyangdaxiaodeyuanxingmugai,nishiruhezhizuode?

 

 

 

 

huodongmude:

(1)suitanglianxi——gongguzhaosanjiaoxingdewaixindefangfa,jinyibutiyan“buzaitongyizhixianshangdesandianquedingyigeyuan”deshishi.lingwaiyetihuidaosanjiaoxingdexingzhuangduitadewaixinweizhidailaideyingxiang.

秒速赛车(2)tongguopanduan④helianxi(3)mudeshijiashenxueshengduijielundelijieheyingyong,peiyangxuesheng“yongshuxue”deyishi.

shijijiaoxuexiaoguo:xueshengdounengshulianwanchengsuitanglianxijipanduanti,shoudaolejiaohaodejiaoxuexiaoguo.tongshiyindaoxueshenglijiejiyipanduan④dejielun,jiashenledui“sanjiaoxingwaixin”delijie.danbufenxueshengzaiwanchenglianxi(3)shiyudaolekunnan,buhuijiangwentizhuanhuacheng“zhaosanjiaoxingwaixin——zhaochuhushangsangedian”dewenti,shuomingzheibufenxueshengzonghelijieheyunyongzhishinenglihaiyoudaitigao.

diwuhuanjie: ketangxiaojie

huodongneirong:

1、xueshengxiaozumiaosusaichebenjiekexuexidetihuijiyaozhangwodezhishihefangfa;

2、gerenrengcunzaidewenti;

秒速赛车3、shishenggongtongwanchengruxiadewenti:

 


(1)quedingyuandetiaojian——


  圆心、半径 

 



(2)锐角三角形                             在三角形的内部

直角三角形          外心的位置               在斜边上

秒速赛车dunjiaosanjiaoxing                             zaisanjiaoxingdewaibu

秒速赛车ersanjiaoxingdewaixinjuyoudetezhengshi: daosangedingdiandejulixiangdeng,yintashisanbianzhongchuixiandejiaodian.

huodongmude: gulixueshengdadanfabiaozijideyijianheshouhuoganxiang,tingqubierendefayan,peiyangyuyanbiaodaheyurenmiaosusaichedeyishi,dadaoqingganhejiazhidemubiao.tongshitongguoshishenggongtongdexiaojie,jiashenxueshengduisuoxuezhishidelijiejiyi.

秒速赛车shijijiaoxuexiaoguo: zaiduanduanjifenzhongdexiaojiehuodongzhong,xueshengnengchangsuoyuyan,changtanzijideshouhuoheganshou,biruyouxietongxuetandaoxuehuilezhaosanjiaoxingdewaixin;kaolvwentiyaoquanmian;yongshuxuezhishikeyijiejueyixieshijiwenti;shuxuezhishishihuanhuanxiangkou,jinmilianxi,meiyizhishidiandouyaoxuehao、lijiehaodeng.

diliuhuanjie: buzhizuoye

1.xiti3.6

秒速赛车2.yuxixiajiekeneirong,soujixianshishenghuozhongdezhixianheyuandeweizhiguanxidexianxiang.

si、jiaoxuefansi

1. yaochuangzaoxingdishiyongjiaocai,linghuijiaocaizhongyinhandeshuxuesixiang

(1)jiaocaizhishiweijiaoshitigongzuijibendejiaoxuesucai,jiaoshikeyigenjuxuyaojinxingshidangdediaozheng.bentaojiaocaicaiyong“wentiqingjing——jianlimoxing——jieshi、yingyongyutuozhan”demoshizhankai,suoyikeqianjiaruleyigeshijibeijingdewentiyinchuxuexizhuti,zheiyouzhuyuzhanxianshuxueyuxianshidelianxi,jifaxueshengdetanjiureqing,weibenjiekehoumiandetanjiuhuodongtigongdongli.

(2)jiaocaiyikaishishicongjingguoyidian、liangdian、sandianhuazhixianguodudaojingguoyidian、liangdian、sandiannengzuojigeyuan?zheibingbushiyigekeyoukewudeguocheng,takeyipeiyangxueshengyizhongleibiguinadesiweifangfa,duixueshengtanjiubenkedewentiyouyigehenhaopudianheyindaozuoyong.

2. zhongshizhanxianshuxuezhishidexingchengheyingyongguocheng

秒速赛车jinglizhishidexingchengyuyingyongguocheng,jiangyouliyuxueshenggenghaodilijieshuxue、yingyongshuxue,zengqiangxuehaoshuxuedexinxin.yincibenjiekeanpailejigexueshengdetanjiuhuodong,tongguotanjiuhoudui“weishenme”dehuida,shixueshengqinshenganshoujielundexingchengguochenghejielundequedingxing.zheiyouzhuyuxueshengjinglizhenzhengde“zuoshuxue”he“yongshuxue”guocheng,zhubufazhanxueshengdeyingyongyishihetuilinengli.

3. xiangxinxueshengbingweixueshengtigongchongfendetanjiuhezhanshizijidejihui

秒速赛车shuxuejiaoxueshishuxuehuodongdejiaoxue,xiangxueshengtigongchongfendecongshishuxuehuodongdejihui,kezaihuodongzhongjifaxuexiqianneng,cushixueshengzaitanjiuhemiaosusaichezhonglijiehezhangwoshuxuezhishi、jinenghesixiangfangfa,tongshiyeyouliyujiaoshifaxianxueshengjiejuewentiguochengzhongcunzaidewenti.yibiangenghaodizhidaoxueshengdexuexiheyincaishijiao.

4. zhuyigaijindefangmian

秒速赛车(1)xueshengdetanjiuhuodongshijianyaodedaobaozheng,rangxueshengzhenzhengchengweixuexidezhuren,jiaoshizhishizuzhizhe、yindaozhe,buyaoyongjiaoshidejianglaidaitixueshengdezuo.

(2)jiaoxueguochengzhongfaxianshaoshukunnanshengzaitanjiuhuodongzhongtaiduqianjiji,jiaoshiyaojishijiyuzhidaoheyindao,huanqitamenxuexidejijixing.

(3)xianduanzhongchuixiandexingzhiyuzhaosanjiaoxingdewaixindexianghuguanxiyoushaoshuxueshenglijiedehaibushihentouche,jinhouzaijinxing“xianduanzhongchuixian”dejiaoxueshirengyaojiayigaijin.


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