如何表示一个圆锥体的方程
\u628a\u4e00\u5757\u68f1\u957f\u4e3a6\u5206\u7c73\u7684\u6b63\u65b9\u4f53\u94a2\u576f,\u70d9\u94f8\u6210\u4e00\u4e2a\u9ad89\u5206\u7c73\u7684\u5706\u9525\u4f53.\u8fd9\u4e2a\u5706\u9525\u4f53\u7684\u5e95\u9762\u79ef\u662f\u591a\u5c11\u5e73\u65b9\u5206\u7c73?(\u65b9\u7a0b\u89e3)\u201cOY\u540c\u5b66\u201d:\u60a8\u597d\u3002
\u8bbe\u5706\u9525\u5e95\u9762\u4e3an\u5e73\u65b9\u5206\u7c73\uff0c\u5217\u65b9\u7a0b\u5f0f\u5982\u4e0b\uff1a
6³dm³=\uff089n\uff09dm\u00f73
216dm²=3n
n=72dm²
\u7b54\u5706\u9525\u5e95\u9762\u79ef\u4e3a72\u5e73\u65b9\u5206\u7c73\uff0c
\u4f60\u8bf4\u5bf9\u5417\uff0c\u795d\u597d\uff0c\u518d\u89c1\u3002
\u60a8\u597d\uff1a
\u8bbe\u8fd9\u4e2a\u6570\u662fx
x+5x0.3=4.5
x+1.5=4.5
x=4.5-1.5
x=3
\u5982\u679c\u672c\u9898\u6709\u4ec0\u4e48\u4e0d\u660e\u767d\u53ef\u4ee5\u8ffd\u95ee\uff0c\u5982\u679c\u6ee1\u610f\u8bf7\u70b9\u51fb\u53f3\u4e0b\u89d2\u201c\u597d\u8bc4\u201d
\u5982\u679c\u6709\u5176\u4ed6\u95ee\u9898\u8bf7\u91c7\u7eb3\u672c\u9898\u540e\uff0c\u53e6\u5916\u53d1\u5e76\u70b9\u51fb\u6211\u7684\u5934\u50cf\u5411\u6211\u6c42\u52a9\uff0c\u7b54\u9898\u4e0d\u6613\uff0c\u8bf7\u8c05\u89e3\uff0c\u8c22\u8c22\u3002
O(\u2229_\u2229)O\uff0c\u8bb0\u5f97\u91c7\u7eb3\uff0c\u4e92\u76f8\u5e2e\u52a9
\u795d\u5b66\u4e60\u8fdb\u6b65\uff01
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绛旓細鈭燗BO=90掳锛屸垹BAO=伪銆倀an鈭燘AO=tan伪锛漁B/AB=|z|/鈭(x^2+y^2)锛屾墍浠ラ敟闈鐨勬柟绋鏄細z^2=(tan伪)^2(x^2+y^2).鍦ㄤ簩娆℃洸闈㈤噷锛屾き鍦嗛潰銆佸弻鏇查潰銆侀敟闈佹き鍦嗘姏鐗╅潰浠ュ強妞渾鏌遍潰閮藉叿鏈夊渾褰㈡埅绾匡紝濡傛灉鏌涓涓5261骞抽潰鎴簩娆℃洸闈簬涓涓渾鍛紝鍒欐墍鏈夊钩琛屼簬瀹冪殑骞抽潰涔熸埅璇ユ洸闈簬涓涓渾鍛ㄣ
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绛旓細閿ラ潰涓婁换鎰忎竴鐐笰(x,y,z)鍚憐杞存姇褰憋紝鍨傝冻B(0,0,z)銆傗柍AOB鏄洿瑙掍笁瑙掑舰锛屸垹ABO=90掳锛屸垹BAO=伪銆倀an鈭燘AO=tan伪锛漁B/AB=|z|/鈭(x^2+y^2)锛屾墍浠ラ敟闈鐨勬柟绋鏄細z^2=(tan伪)^2(x^2+y^2).鍦ㄤ簩娆℃洸闈㈤噷锛屾き鍦嗛潰銆佸弻鏇查潰銆侀敟闈佹き鍦嗘姏鐗╅潰浠ュ強妞渾鏌遍潰閮藉叿鏈夊渾褰㈡埅绾裤傚鏋滄煇涓涓...
绛旓細甯歌鐨鍦嗛敟鏇茬嚎鏂圭▼锛1銆佸渾 鏍囧噯鏂圭▼锛(x-a)^2+(y-b)^2=r^2,鍦嗗績(a,b),鍗婂緞=r>0 绂诲績鐜囷細e=0(娉ㄦ剰锛氬渾鐨勬柟绋鐨勭蹇冪巼涓0锛岀蹇冪巼绛変簬0鐨勮建杩逛笉鏄渾,鑰屾槸涓涓鐐(c,0)涓鑸柟绋嬶細x^2+y^2+Dx+Ey+F=0,鍦嗗績(-D/2,-E/2),鍗婂緞r=(1/2)鈭(D^2+E^2-4F)2銆佹き鍦 鏍囧噯鏂圭▼...
绛旓細鏍规嵁棰樻剰鑰岀煡锛氬渾鏌辩殑鍏垎涔嬩簲浣撶Н+鍦嗛敟浣撶Н=14*9*2 鍒楀紡锛氳鍦嗘煴浣撶Н涓簒 5/6x+1/3x=14*9*2 x=216 鍦嗘煴浣撶Н涓216绔嬫柟鍘樼背锛屽渾閿ヤ綋绉负72绔嬫柟鍘樼背
绛旓細x^2+y^2=(r^2/h^2)*z^2
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