设B(X1ï¼Y1)D(X2ï¼Y2)BDä¸ç¹ä¸ºNï¼x0ï¼y0ï¼
âµB,Då¨æ¤åx²/4+3y²/4=1ä¸
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x2²/4+3y2²/4=1â¡
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ï¼x1-x2ï¼ï¼x1+x2ï¼/4=ï¹£3ï¼y1-y2ï¼ï¼y1+y2ï¼/4
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å³KBD*KON=ï¹£1/3
ç±é¢Kac=tan135°=ï¹£1
设ACï¼y=ï¹£x+b
âµACè¿ç¹ï¼1ï¼2ï¼
â´ACï¼y=ï¹£x+3
âµACåç´BD
â´KBD=1å³KON=ï¹£1/3
å 为Nå¨acä¸
å³x0+y0ï¹£3=0
yo/x0=ï¹£1/3
â´x0=9/2y0=ï¹£3/2
BD:y=xï¹£6
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