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                  視頻 > 數學資料詳情

                  人教版九年級數學下冊26.2.1反比例函數在實際中的應用[李老師]【市一等獎】優質課 (2份打包)

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                  ID:11099055 大小:195089KB 播放:63 下載:10 時間:2019/08/12 22:55 分類: 全國 , 2019
                  課程介紹
                  心系雙曲線 --------反比例函數與幾何面積 莆田哲理中學   李淑琴 一.復習 1.什么是三角形的外心、內心?
                  外心:三角形外接圓的圓心叫三角形的外心,          
                            是三邊垂直平分線的交點
                  內心: 三角形內切圓的圓心叫三角形的內心,  
                            是三個內角角平分線的交點



                  2.矩形的中心在哪里? 矩形的中心:矩形對角線的交點

                  3.反比例函數中K的幾何意義?

                  典型例題: 1.如圖,矩形ABCD中心在原點,點A、C在雙曲線              上,AB∥y軸,AD∥x軸,若矩形ABCD的面積為8,則k=  (    )  



                  2.如圖,等邊△ABC的邊長是2,外心O是直角坐標系的原點,點B在y軸上,若反比例函數          (x》0)經過點C,則k的值為(      )

                  鏈接中考: 1. (2014?莆田)如圖,在平面直角坐標系中,直線l與x軸相交于點M,與y軸相交于點N,Rt△MON的外心為點A(    ,﹣2),反比例函數    
                  壓縮包中的資料:
                  人教數學九下26.2.1反比例函數在實際中的應用[李老師]【市一等獎】優質課.ppt
                  人教數學九下26.2.1反比例函數在實際中的應用[李老師]【市一等獎】優質課.TS [來自e網通客戶端]
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