1.ç±é¢ç¥å¾2a=4ï¼a=2ï¼e=c/a=â2/2,c=â2,b=â(a^2-c^2)=â2æ¤åæ¹ç¨æ¯x^2/4+y^2/2=1ã
2.设å¨ç¹Påæ 为(x,y)åç±å¨ç¹På
³äºç´çº¿y=2xç对称ç¹ä¸ºP1(x1,y1)å¾(y+y1)/2=2(x+x1)/2,(y-y1)/(x-x1)=-1/2åç®ä¸¤å¼åå¾ï¼2x-y=y1-2x1,2y+x=2y1+x1,åä¸å¼åÃ2å ä¸åä¸å¼åæ¶å»yå¾3x1-4y1=-5x,èç¹På¨x^2/4+y^2/2=1ä¸,æ以0<=x^2/4<=1,-2<=x<=2,-10<=-5x<=10,æ以3X1-4Y1çåå¼èå´ä¸º[-10,10]ã
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