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x²+y²+4x-2y+4=0表示以M(-2, 1)为åå¿ã1为åå¾çåã
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è¿åå¿Mä½ç´çº¿y=x-1çå线ï¼å足为Hï¼å¹¶å»¶é¿HM交åå¦ä¸ç«¯äºP
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MP=l -2+(-1)+(-1) l÷â2=2â2
â´HP=2â2+1
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