两ç§æ¹æ³.
ä¸ãåé M1M2 = ï¼-3,-3,3ï¼,M1M3=ï¼0,-2,-1ï¼,
å æ¤å¹³é¢çæ³åé为 n=M1M2ÃM1M3 =ï¼9,-3,6ï¼,
å 为平é¢è¿ M1,å æ¤æ¹ç¨ä¸º 9(x-1)-3(y-1)+6(z+1)=0 ,åç®å¾ 3x-y+2z = 0 .
äºã设平é¢æ¹ç¨ä¸º Ax+By+Cz+D=0 ,
å° M1ãM2ãM3 çåæ åå«ä»£å
¥,å¾ä¸ä¸ªæ¹ç¨ï¼
ï¼1ï¼A+B-C+D=0 ï¼
ï¼2ï¼-2A-2B+2C+D=0 ï¼
ï¼3ï¼A-B-2C+D=0 ,
è§£å¾ B = -A/3,C = 2A/3 ,D = 0 ,
å A = 3 ,å B = -1,C = 2 ,D = 0 ,
å æ¤ææ±å¹³é¢æ¹ç¨ä¸º 3x-y+2z=0 .
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