1)é¦å
ä»ç®åå¼å§,å¦ææ¯å¹³é¢F(x,y)=0
ä¸è¬å½¢å¼æ¯Ax+By+C=0
æ³åéæ¯(A,B).å 为任æä¸ç¹(x0,y0)å¨å¹³é¢ä¸,A*x0+B*y0+C=0
é£ä¹A*(x-x0)+B*(y-y0)=0,å³åé(A,B)*(x-x0,y-y0)=0
2)对äºä¸è¬æ²é¢ F(x,y,z,â¦â¦)=0
两边微å(å导ç¨å¤§åD),ædF=DF/DX*dx + DF/DY*dy + DF/DZ*dz + â¦â¦= d0 = 0
é£ä¹åé(DF/DX ,DF/DY ,DF/DZ ,â¦â¦) * (dx ,dy ,dz,â¦â¦)=0
å
¶ä¸åé(dx ,dy ,dz,â¦â¦)å¿
å®å¨å¹³é¢ä¸(dæ¯å¾®åå,æ²é¢çå¾®å°ååé)
æ以åé(DF/DX ,DF/DY ,DF/DZ ,â¦â¦) æ¯æ²é¢çæ³åé
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