å 为ææ±å¹³é¢è¿ç´çº¿ ï½2x+y-3z+2=0 ï¼5x+5y-4z+3=0 ï¼
å æ¤å¯è®¾æ¹ç¨ä¸º (2x+y-3z+2)+k(5x+5y-4z+3)=0 ï¼
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¥å¯å¾ 8-3-3+2+k*(20-15-4+3)=0 ï¼
è§£å¾ k= -1 ï¼
æ以ææ±å¹³é¢æ¹ç¨ä¸º (2x+y-3z+2)-(5x+5y-4z+3)=0 ï¼
åç®å¾ 3x+4y-z+1=0 ã
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