(1)设ï¼xï¼yï¼æ¯å¯¹ç§°ç´çº¿ä¸ä»»ä¸ç¹ï¼å®å
³äºï¼3ï¼2ï¼ç对称ç¹æ¯ï¼6-xï¼4-yï¼ï¼
æ以 4-y = 3(6-x)+3ï¼åç®å¾ y = 3x-17 ã
(2)设Pï¼xï¼yï¼æ¯å¯¹ç§°ç´çº¿ä¸ä»»ä¸ç¹ï¼P å
³äºç´çº¿ L ç对称ç¹ä¸º Qï¼aï¼bï¼ï¼
å PQä¸L ==ã (y-b)/(x-a) = -1/3 ï¼
PQ ä¸ç¹å¨ L ä¸ ==ã(y+b)/2 = 3*(x+a)/2 + 3ï¼
ç±ä»¥ä¸ä¸¤å¼è§£å¾ a = (3y-4x-9)/5ï¼b = (4y+3x+3)/5ï¼
ç±äº Q å¨ç´çº¿ x-y-2=0ä¸ï¼å æ¤ a-b-2=0ï¼
代å
¥å¹¶åç®å¾ 7x+y+22 = 0 ã
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