双曲线中abc和抛物线中abc一样么 双曲线的性质！！求图！！abc分别代表什么？求图说明。还有焦...
\u692d\u5706\u4e0e\u53cc\u66f2\u7ebf\u7684\u533a\u522b\u548c\u8054\u7cfb\uff0c\u692d\u5706\u7684abc\u5206\u522b\u6307\u4ec0\u4e48\uff0c\u53cc\u66f2\u7ebf\u7684abc\u5206\u522b\u6307\u4ec0\u4e48
\u692d\u5706a\u6307\u5de6\u53f3\u4e24\u8fb9\u7684\u9876\u70b9 b\u6307\u4e0a\u4e0b\u4e24\u7aef\u7684\u9876\u70b9 c\u662f\u6307\u5de6\u53f3\u4e24\u7aef\u7684\u7126\u70b9 2c=F1F2\u7684\u8ddd\u79bb \u540c\u7406\u4f60\u5e94\u8be5\u77e5\u9053a b\u8ddd\u79bb\u591a\u5c11 \u7531\u6b64\u63a8\u53cc\u66f2\u7ebf \u692d\u5706\u4e2d a\u5927\u4e8ec\u5927\u4e8eb c/a\u662f\u692d\u5706\u548c\u53cc\u66f2\u7ebf\u7684\u79bb\u5fc3\u7387 \u692d\u5706\u4e0a\u4efb\u610f\u4e00\u70b9\u5230\u692d\u5706\u4e24\u7126\u70b9\u7684\u8ddd\u79bb\u76f8\u52a0=2a \u53cc\u66f2\u7ebf\u662f\u4e24\u4e2a\u8ddd\u79bb\u76f8\u51cf
\u6211\u4f1a\u4e0d\u4f1a\u8bf4\u591a\u4e86\u4f60\u4eec\u8fd8\u6ca1\u6559
\u7531\u5706\u65b9\u7a0b\u5730\u5706\u5fc3\uff083\uff0c2\uff09\uff0c\u534a\u5f84\u6839\u53f75
\u5f53y=0\u65f6\uff0c\u4ee3\u5165\u5706\u65b9\u7a0b\uff0c\u5f97x~2-6x+8=0
\u7528\u5341\u5b57\u76f8\u4e58\u6cd5\u5206\u89e3\u56e0\u5f0f\u5f97\uff08x-2\uff09*\uff08x-4\uff09=0
\u6240\u4ee5\u5706\u4e0ex\u8f74\u4ea4\u70b9\uff082\uff0c0\uff09\uff0c\uff084\uff0c0)
\u6240\u4ee5a=2\uff0cc=4
\u8ba1\u7b97\u5f97b=2\u6839\u53f73
\u5219\u53cc\u66f2\u7ebf\u65b9\u7a0b\u4e3a\uff08x~2\uff09/4 - \uff08y~2\uff09/12 =1
\u5e2e\u5230\u4f60\u5c31\u7ed9\u4e2a\u597d\u8bc4\u5427
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绛旓細鎮ㄨ涓猴紝 鍙屾洸绾涓庢姏鐗╃嚎鐨涓や釜鐒︾偣妯潗鏍囦竴鏍峰氨璁や负鑱旂珛缁撴瀯灏变竴瀹氭槸涓や釜鐩稿悓鏍规墍浠ユ湁 X1+X2=P 鎺ㄥ嚭a鏂/b鏂=1/2 浣嗕綘绠椾竴涓 鏍圭殑鍒ゅ埆寮 鏄ぇ浜庨浂鐨 杩欒鏄 鑱旂珛缁撴灉 搴旀槸涓や釜涓嶅悓鏍 鎵浠ュ簲璇ヨ繖涔堢畻 鏄剧劧 p=2c 杩欐牱鍙互姹傚嚭涓涓氦鐐 锛坈锛2c锛夊皢璇ョ偣甯﹀叆 鍙屾洸绾夸腑 杩欐牱灏卞彧鏈abc浜 ...
绛旓細锛1锛夎В锛氭槗鐭ワ紝A(-a,0),B(0,b),F(c,0).===>3ac=BA*BF=(-a,-b)*(c,-b)=b^2-ac.===>b^2=4ac.===>c^2-a^2=4ac.===>e^2-4e-1=0.===>e=2+鈭5.(2)瑙ｏ細鑻鎶涚墿绾鏂圭▼涓簒^2=2py(p>0),鍒欐湁2pm=9,(p/2)+m=5.(m>0).===>p=1,m=9/2.鎴杙=9,...
绛旓細鍝綅澶т簨鑳界粰鎴戝綊绾充竴涓嬮珮涓暟瀛﹁В鏋愬嚑浣曞晩,妞渾,鍙屾洸绾,鎶涚墿绾跨殑鐭ヨ瘑銆 鍝綅澶у笀鑳界粰鎴戝綊绾充竴涓嬪晩,瑙ｆ瀽鍑犱綍鏄垜鏈澶х殑鐥涖傛眰甯姪銆... 鍝綅澶у笀鑳界粰鎴戝綊绾充竴涓嬪晩,瑙ｆ瀽鍑犱綍鏄垜鏈澶х殑鐥涖傛眰甯姪銆 灞曞紑 3涓洖绛 #鐑# 濡備綍缂撹В鐒﹁檻鎯呯华?鍖垮悕鐢ㄦ埛 2013-12-23 灞曞紑鍏ㄩ儴 (涓)妞渾鍙婂叾鏍囧噯鏂圭▼1. 妞渾...
绛旓細鎶涚墿绾鏄寚骞抽潰鍐呭埌涓涓畾鐐笷鍜屼竴鏉″畾鐩寸嚎l璺濈鐩哥瓑鐨勭偣鐨勮建杩广傚畠鏈夎澶氳〃绀烘柟娉曪紝渚嬪鍙傛暟琛ㄧず锛屾爣鍑嗘柟绋嬭〃绀虹瓑绛夈 瀹冨湪鍑犱綍鍏夊鍜屽姏瀛︿腑鏈夐噸瑕佺殑鐢ㄥ銆 鎶涚墿绾夸篃鏄渾閿鏇茬嚎鐨涓绉嶏紝鍗冲渾閿ラ潰涓庡钩琛屼簬鏌愭潯姣嶇嚎鐨勫钩闈㈢浉鎴屽緱鐨勬洸绾裤傛姏鐗╃嚎鍦ㄥ悎閫傜殑鍧愭爣鍙樻崲涓嬶紝涔熷彲鐪嬫垚浜屾鍑芥暟鍥惧儚銆鍙屾洸绾鏄畾涔変负...
绛旓細棰樼洰閿欎簡 鐢讳竴涓嬪浘 PF2涓瀭绾夸笉鍙兘杩嘑1 搴斿綋涓篜F1涓瀭绾胯繃F2 濡傛灉鏄繖鏍凤紝鍒 鍥犱负PF1涓瀭绾胯繃F2,鎵浠2P锛滷1F2锛2c 鍙堝洜涓篎2涓烘姏鐗╃嚎鐒︾偣锛屾墍浠ヨ繃F1涓斿瀭鐩翠簬x杞寸殑鐩寸嚎涓鎶涚墿绾跨殑鍑嗙嚎锛岃孭鍦ㄦ姏鐗╃嚎涓婏紝鎵浠鍒板噯绾跨殑璺濈锛漃F2锛滷1F2锛2c 鎵浠鍦‵2姝ｄ笅鏂癸紝鍗砅F2鈯1F2 鎵浠F1锛濅袱鍊...
绛旓細2銆佸绉版э細鍏充簬鍧愭爣杞村拰鍘熺偣瀵圭О.3銆侀《鐐癸細A(-a,0), A锛(a,0).鍚屾椂 AA锛囧彨鍋鍙屾洸绾跨殑瀹炶酱涓斺垼AA锛団攤=2a.B(0,-b), B锛(0,b).鍚屾椂 BB锛囧彨鍋氬弻鏇茬嚎鐨勮櫄杞翠笖鈹侭B锛団攤=2b.4銆佹笎杩戠嚎锛氱劍鐐瑰湪x杞达細y=卤(b/a)x.鐒︾偣鍦▂杞达細y=卤(a/b)x. 鍦嗛敟鏇茬嚎蟻=ep/1-ecos胃褰揺>1鏃,...
绛旓細鎶涚墿绾夸笌鍙屾洸绾跨殑浜ょ偣(a,b) (a,-b) 锛屼笖a>0 x=a 鍙湁涓涓瀵瑰簲涓や釜y鍊 鍗硏1,x2涓彧鏈夊ぇ浜0鐨勬牴鎵嶆槸鎵姹傜殑銆備綘瀵箈1*x2<0涓嶈兘鐞嗚В鍚 鏄洜涓轰綘璁や负x1,x2閮芥槸鎵姹傜殑浜ょ偣锛屼簨瀹炰笂鍙湁涓涓槸鎵姹傜殑锛岃繕鏈変竴涓槸灏忎簬0鐨勶紝杩欐槸鍥犱负鍙屾洸绾涓庢姏鐗╃嚎閮藉惈鏈2娆 鎵浠ヨ繖鏄袱涓簩鍏冧簩娆℃柟绋...
绛旓細鈭磌=-4锛屸埓鍙屾洸绾跨殑瑙ｆ瀽寮忎负y=-4/x锛屸埖BC涓x杞翠箣闂寸殑璺濈鏄偣B鍒皔杞磋窛绂荤殑4鍊嶏紝鈭磋B鐐瑰潗鏍囦负锛坢锛-4m锛夛紙m锛0锛変唬鍏ュ弻鏇茬嚎瑙ｆ瀽寮忓緱m=1锛屸埓鎶涚墿绾y=ax2+bx+c锛坅锛0锛夎繃鐐笰锛-2锛2锛夈丅锛1锛-4锛夈丱锛0锛0锛夛紝鈭4a-2b+c=2 a+b+c=-4 c=0 鈭碼=-1 b=-3 c=0 鏁...
绛旓細鍒嗘瀽锛氾紙1锛夋牴鎹凡鐭ユ潯浠跺彲浠ユ帹鍑篈鐐圭殑鍧愭爣锛屾妸A銆丅涓ょ偣鐨勫潗鏍囦唬鍏ユ姏鐗╃嚎瑙ｆ瀽寮忓拰鍙屾洸绾胯В鏋愬紡锛屽嵆鍙緱鍑篴銆乥銆乲鐨勫硷紝灏卞彲浠ョ‘瀹鍙屾洸绾垮拰鎶涚墿绾跨殑瑙ｆ瀽寮忎簡锛涳紙2锛夋牴鎹瓵銆丅鎶涚墿绾胯В鏋愬紡锛屽彲浠ョ‘瀹欳鐐圭殑鍧愭爣锛屽嵆鍙幓椤禔C鍜孉C杈逛笂鐨勯珮鐨勯暱搴︼紝灏卞彲浠ヨ绠楀嚭鈻ABC鐨勯潰绉簡锛涳紙3锛夋牴鎹鎰忕敾鍑哄浘褰紝...
绛旓細鎶涚墿绾鐒︾偣鏄痯/2=c锛屽垯锛歱=2c锛屽垯鎶涚墿绾垮噯绾挎槸x=锛峜锛屽垯涓ゆ洸绾夸氦鐐规槸(c锛2c)锛岃繖涓偣鍦鍙屾洸绾涓婏紝寰楋細c²/a²锛(4c²)/(b²)=1 (c²/a²)锛1=(4c²)/(b²)b²/a²=4c²/b²b²=2ac c²锛2ac...
