设ææ±å¹³é¢æ¹ç¨ä¸º m(x+y-z-1)+n(x-y+z+1) = 0ï¼
å为 (m+n)x+(m-n)y+(-m+n)z+(-m+n) = 0ï¼
å 为å®ä¸å·²ç¥å¹³é¢åç´ï¼å æ¤ m+n+m-n-m+n = 0ï¼
åç®å¾ m+n = 0 ï¼å m = 1ï¼n = -1 å¾ææ±å¹³é¢æ¹ç¨ä¸º
(x+y-z-1) - (x-y+z+1) = 0ï¼åç®å¾ y - z - 1 = 0 ã
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