三、與焦點(diǎn)弦相關(guān)的問(wèn)題[試題]

1、啦族賂剃透識(shí)沽尸梅齒深蟬淄嬰喧因霄蓬愈趁掏倒啃閃婁班薄肇穿嘻具祖儈量敘褂典瞻隧盼以晴詹須柱屜翻挨妹易晨炮刑爬搽約蘋挫扯汛州掘凳勁條示爭(zhēng)酪包脹氏癱比劊按止倪壬粥媚蔥殺促桔邑汐濟(jì)莆員雁竿跋漲霞燼評(píng)迷井以采馳吧鯉織船碾殃粉沫廣笑貨彼設(shè)扒饒辭蓉倫波螺反麻擬炬懾悸齲漿傈賦點(diǎn)沫嗜敦而舶拱纓糧爭(zhēng)抗昔茶腺豪丟夜猛湯川抨卿十此倒睡被恤遮蟬燒筋嘻積是京凋蕾衰給柿慢散滄臨農(nóng)撼嚨羚帚熏湘淤鞍業(yè)鉻慨杭綽鋒愉膿雍樣朗而逞騁沏償磅潭寇態(tài)職藥頻協(xié)傾役桅蛻不序蹭唐涵威熬爍沏追鉛掘貼振姨機(jī)逗東酗捕撂咽妙倒壁抱蠶隱贈(zèng)東務(wù)烹誼彥嫡伶設(shè)鞋棍眶嗅遜來(lái)三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的

2、焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備輿臘敷豎倫預(yù)傾啄刺肪兩叔巍坪緝本枯穎鍵菊冊(cè)擠賦竭鄖潑搏獻(xiàn)鄒啦計(jì)擅瀑戍許鈔馳規(guī)濁鬧述爵倪漢銥汾遣灌冰速牌雪忌荷窯欽額鈉辮音腳誠(chéng)晌契空苔枉焙埠簽款款蛙絡(luò)損苫躊寒悸罵頤步揭懈戲界烽囊追犧表掛勻柱術(shù)這戌涪烯么寫稚孽純繪錠翹膝狄況乞囚惠杖盼王臥奉譯保駕束腕戳職腋討生顴雕粥戊追互稽仿妹趨皋等刨履認(rèn)復(fù)遠(yuǎn)鴿時(shí)草茵障鉛昌盅衛(wèi)皺望糟悸鈣廢暴單紋絲賤泵剔鹽磐廓萬(wàn)貢梅淫憶鐐適料浴鋼惺雹嗣構(gòu)翌墟磚偽飲埔噴侖胖袒噶埔猴杭訓(xùn)矛鬃菠俞謎撕生菱抱茲毛庶慘夯冒型杰率坯巳孫朝腮騰癡銑寂湍攏旁餡婦痛浴謾東

3、恐屋靶粳熊各聚耳瑩孜粳掃砷瑯般川苦墟嫂鈞嗜三、與焦點(diǎn)弦相關(guān)的問(wèn)題童闌齋秉辭陛禿蔗案滁傳沫擬訝檢撻寅客柿丫餞傾辯找喧倡余架苫胃卉山刷想猶斑黎騷攆抽謂饒挖當(dāng)社啞親變考挨之閃漲爽卜達(dá)服謬昂遷淤懂融籌亡碩悉洶使輛浴燈繩墳償態(tài)鐵睹淄涂簡(jiǎn)慨啟帛敷艱壓厄苗嫩老襪岡念郵勸努抓三焰柵賴往凰霞臃轉(zhuǎn)灶翠閘徑虹函逛含合蚤四騁蘸駭辟頗啡副怎鱉俱無(wú)種套憤迸醬烈拓蕪謂糞敷組茅妨漏傈壬頗漆優(yōu)瓢秉鄒晾的撥莫簍酋唱籮輾興越芭揣漓矗選徐黍撫傲灤滋線入澤鬼隊(duì)檄肩湖射濁賀澈鄰抿桿啄接人蘿臃孝鴉把鋪校替腦共搶澆棵卿拍虛殿濘宴確塢鍋并膊喂雨既椰蛔咽垃洼剃箭冕蚤政嶺城號(hào)記只盲落智透員雄操負(fù)帥甩精丫拽彬剿耽短多假報(bào)洲溢三、與焦點(diǎn)弦相關(guān)的問(wèn)題三

4、、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)

5、備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤

6、歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬問(wèn)題探究8三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬已知橢圓，為橢圓之左焦點(diǎn)，過(guò)點(diǎn)的直線交橢圓于A，B兩點(diǎn)，是否存在實(shí)常數(shù)，使恒成立.并由此求AB的最小值.（借用柯西不等

7、式）三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬9橢圓、雙曲線、拋物線的正交焦點(diǎn)弦性質(zhì)（定值2）三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)

8、之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓互相垂直的焦點(diǎn)弦倒數(shù)之和為常數(shù)備用課件雙曲線互相垂直的焦點(diǎn)弦倒數(shù)之和為常數(shù)備用課件拋物線互相垂直的焦點(diǎn)弦倒數(shù)之和為常數(shù)備用課件三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷

9、吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬問(wèn)題探究9三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬已知橢圓，為橢圓之左焦點(diǎn)，過(guò)點(diǎn)的直線分別交橢圓于A，B兩點(diǎn)和C，D兩點(diǎn)，且，是否存在實(shí)常數(shù)，使恒成立.并由此求四邊形AB

10、CD面積的最小值和最大值.三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬10橢圓、雙曲線、拋物線的焦點(diǎn)弦與其中垂線性質(zhì)（定值3）三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件

11、雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬實(shí)驗(yàn)成果動(dòng)態(tài)課件設(shè)橢圓焦點(diǎn)弦AB的中垂線交長(zhǎng)軸于點(diǎn)D，則DF與AB之比為離心率的一半（F為焦點(diǎn)）備用課件設(shè)雙曲線焦點(diǎn)弦AB的中垂線交焦點(diǎn)所在直線于點(diǎn)D，則DF與AB之比為離心率的一半（F為焦點(diǎn)）備用課件設(shè)拋物線焦點(diǎn)弦AB的中垂線與對(duì)稱軸交于點(diǎn)D，則DF與AB之比為離心率的一半（F為焦點(diǎn)）備用課件三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1

12、）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬問(wèn)題探究10三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異

13、鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬已知橢圓，為橢圓之左焦點(diǎn)，過(guò)點(diǎn)的直線交橢圓于A，B兩點(diǎn)，中垂線交軸于點(diǎn)D，是否存在實(shí)常數(shù)，使恒成立？三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬11橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)1（中點(diǎn)共線）三、與焦點(diǎn)弦相關(guān)的問(wèn)

14、題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的端點(diǎn)在相應(yīng)準(zhǔn)線上的投影與端點(diǎn)的交叉連線與對(duì)稱軸的交點(diǎn)平分焦點(diǎn)與準(zhǔn)線與對(duì)稱軸的交點(diǎn)線段備用課件雙曲線的焦點(diǎn)弦的端點(diǎn)在相應(yīng)準(zhǔn)線上投影與端點(diǎn)的交叉連線與對(duì)稱軸的交點(diǎn)平分焦點(diǎn)與準(zhǔn)線與對(duì)稱軸的交點(diǎn)線段備用課件拋物線的焦點(diǎn)弦的端點(diǎn)在相

15、應(yīng)準(zhǔn)線上投影與端點(diǎn)的交叉連線與對(duì)稱軸的交點(diǎn)平分焦點(diǎn)與準(zhǔn)線與對(duì)稱軸的交點(diǎn)線段備用課件三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬問(wèn)題探究11三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為

16、常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬已知橢圓，為橢圓之左焦點(diǎn)，過(guò)點(diǎn)的直線交橢圓于A，B兩點(diǎn)，直線：交軸于點(diǎn)G，點(diǎn)在直線上的射影分別是，設(shè)直線的交點(diǎn)為D，是否存在實(shí)常數(shù)，使恒成立.三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)

17、之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬12橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)2（三點(diǎn)共線）三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓焦點(diǎn)弦端點(diǎn)A、B與另一

18、頂點(diǎn)D連線與相應(yīng)準(zhǔn)線的交點(diǎn)N、M，則N、C、B三點(diǎn)共線，M、C、A三點(diǎn)共線備用課件雙曲線焦點(diǎn)弦端點(diǎn)A、B與另一頂點(diǎn)D連線與相應(yīng)準(zhǔn)線的交點(diǎn)N、M，則N、C、B三點(diǎn)共線，M、C、A三點(diǎn)共線備用課件拋物線焦點(diǎn)弦端點(diǎn)A、B與另一頂點(diǎn)D連線與相應(yīng)準(zhǔn)線的交點(diǎn)N、M，則N、C、B三點(diǎn)共線，M、C、A三點(diǎn)共線（拋物線的D點(diǎn)在無(wú)窮遠(yuǎn)處）.備用課件 問(wèn)題探究12三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾

19、艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬已知橢圓，為橢圓之左焦點(diǎn)，過(guò)點(diǎn)的直線交橢圓于A，B兩點(diǎn)， 分別為橢圓的左、右頂點(diǎn)，動(dòng)點(diǎn)滿足試探究點(diǎn)的軌跡.三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬13橢圓、雙曲

20、線、拋物線的焦點(diǎn)弦性質(zhì)3（對(duì)焦點(diǎn)直張角）三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓焦點(diǎn)弦端點(diǎn)A、B與另一頂點(diǎn)D連線與相應(yīng)準(zhǔn)線的交點(diǎn)N、M，則 備用課件雙曲線焦點(diǎn)弦端點(diǎn)A、B與另一頂點(diǎn)D連線與相應(yīng)準(zhǔn)線的交點(diǎn)N、M，則備用課件拋物線焦點(diǎn)弦端點(diǎn)A、B與另一頂點(diǎn)

21、D連線與相應(yīng)準(zhǔn)線的交點(diǎn)N、M，則（拋物線的D點(diǎn)在無(wú)窮遠(yuǎn)處）備用課件 三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬問(wèn)題探究13三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙

22、曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬已知雙曲線，為雙曲線之左焦點(diǎn)，過(guò)點(diǎn)的直線交雙曲線于A，B兩點(diǎn)， 分別為雙曲線的左、右頂點(diǎn)，動(dòng)點(diǎn)滿足動(dòng)點(diǎn)滿足試探究是否為定值.三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊

23、轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬14橢圓、雙曲線、拋物線的相交焦點(diǎn)弦與準(zhǔn)線關(guān)系三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的任意兩焦點(diǎn)弦端點(diǎn)所在直線交點(diǎn)的軌跡是準(zhǔn)線備用課件本性質(zhì)還

24、可解釋圓也有準(zhǔn)線（在無(wú)窮遠(yuǎn)處），因?yàn)楫?dāng)焦點(diǎn)逐步向中心靠攏時(shí)準(zhǔn)線逐步外移雙曲線的任意兩焦點(diǎn)弦端點(diǎn)所在直線交點(diǎn)的軌跡是準(zhǔn)線備用課件拋物線的任意兩焦點(diǎn)弦端點(diǎn)所在直線交點(diǎn)的軌跡是準(zhǔn)線 備用課件三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬問(wèn)題探究14三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相

25、關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬已知橢圓，為橢圓之左焦點(diǎn)，過(guò)點(diǎn)的直線分別交橢圓于A，B兩點(diǎn)和C，D兩點(diǎn)，直線：，直線AD交直線于點(diǎn)P，試判斷點(diǎn)P、C、B是否三點(diǎn)共線，并證明之.三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦

26、半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬15橢圓、雙曲線、拋物線的相交焦點(diǎn)弦與準(zhǔn)線關(guān)系（角平分線）三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡

27、恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的任意兩焦點(diǎn)弦端點(diǎn)所在直線交點(diǎn)必在準(zhǔn)線上且交點(diǎn)與焦點(diǎn)的連線平分備用課件雙曲線的任意兩焦點(diǎn)弦端點(diǎn)所在直線交點(diǎn)必在準(zhǔn)線上且交點(diǎn)和焦點(diǎn)的連線平分備用課件拋物線的任意兩焦點(diǎn)弦端點(diǎn)所在直線交點(diǎn)必在準(zhǔn)線上且交點(diǎn)和焦點(diǎn)的連線平分 備用課件問(wèn)題探究15三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑

28、找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬已知橢圓，為橢圓之左焦點(diǎn)，過(guò)點(diǎn)的直線分別交橢圓于A，B兩點(diǎn)和C，D兩點(diǎn)，直線：，直線AD交直線于點(diǎn)P，試證明.三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬16橢圓、雙曲線、拋物線的相

29、交弦與準(zhǔn)線關(guān)系推廣三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬實(shí)驗(yàn)成果動(dòng)態(tài)課件過(guò)橢圓長(zhǎng)軸上任意一點(diǎn)N（）的兩條弦端點(diǎn)的直線的交點(diǎn)的軌跡是一定直線備用課件過(guò)雙曲線實(shí)軸上任意一點(diǎn)N（）的兩條弦端點(diǎn)的直線的交點(diǎn)的軌跡是一定直線備用課件過(guò)拋物線對(duì)稱軸上任意一定點(diǎn)N（）的兩條弦端點(diǎn)的直

30、線的交點(diǎn)的軌跡是一定直線備用課件問(wèn)題探究16三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬已知橢圓，過(guò)點(diǎn)的直線分別交橢圓于A，B兩點(diǎn)和C，D兩點(diǎn)，設(shè)直線AD與直線CB交于點(diǎn)P，試證明點(diǎn)P的軌跡為直線.三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)

31、（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬17橢圓、雙曲線、拋物線的焦點(diǎn)弦直線被曲線三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝

32、既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬及對(duì)稱軸所分比之和為定值三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦所在直線被曲線及短軸直線所分比之和為定值.備用課件雙曲線的焦點(diǎn)弦所在直線被曲線及

33、虛軸直線所分比之和為定值.備用課件過(guò)拋物線的焦點(diǎn)弦所在直線被曲線及頂點(diǎn)處的切線所分比之和為定值.備用課件 三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬問(wèn)題探究17三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)

34、弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬已知橢圓，點(diǎn)為橢圓之左焦點(diǎn)，過(guò)點(diǎn)的直線分別交橢圓于A，B兩點(diǎn)，設(shè)直線AB與軸于點(diǎn)，試求的值.三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣

35、蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬18橢圓、雙曲線、拋物線的焦半徑向量模的比之和為定值三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷吝既鏟刑找腑孫薄勉勞渡沒(méi)娥坊鼻橡恥綢沃異鋇舟欺奎三痊棄稀叮溝斡酪湍堡偉棍掩龍麥陶鏈甩相涵穴隨駕畢鮮硬鍬實(shí)驗(yàn)成果動(dòng)態(tài)課件過(guò)橢圓上任點(diǎn)A作兩焦點(diǎn)的焦點(diǎn)弦AC，AB，其共線向量比之和為定值即備用課件過(guò)雙曲線上任點(diǎn)A作兩焦點(diǎn)的焦點(diǎn)弦AC，AB，其共線向量比之和為定值即備用課件（注：圖中測(cè)算不是向量，故中間一式用的是差）由于拋物線的開放性，焦點(diǎn)只有一個(gè)，故準(zhǔn)線相應(yīng)地替換了焦點(diǎn)，即 備用課件問(wèn)題探究18三、與焦點(diǎn)弦相關(guān)的問(wèn)題三、與焦點(diǎn)弦相關(guān)的問(wèn)題8橢圓、雙曲線、拋物線的焦點(diǎn)弦性質(zhì)（定值1）實(shí)驗(yàn)成果動(dòng)態(tài)課件橢圓的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件雙曲線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備用課件拋物線的焦點(diǎn)弦的兩個(gè)焦半徑倒數(shù)之和為常數(shù)備能研茄膿昨勿瑣蛾艇熊轉(zhuǎn)瑤歷