è§£ï¼ x2+y2=7ï¼xy=1 x2+y2+2xy=7+2·1 (x+y)2=9 x+y=3æx+y=-3 x+y=3æ¶ï¼xãyæ¯æ¹ç¨t2-3t+1=0çä¸¤æ ¹ (t- 3/2)2=5/4 t=(3+â5)/2æt=(3-â5)/2 x+y=-3æ¶ï¼xãyæ¯æ¹ç¨t2+3t+1=0çä¸¤æ ¹ (t+ 3/2)2=5/4 t=(â5-3)/2æt=-(3+â5)/2 综ä¸ï¼å¾ï¼ x=(3+â5)/2ï¼y=(3-â5)/2 æ x=(3-â5)/2ï¼y=(3+â5)/2 æ x=(â5-3)/2ï¼y=-(3+â5)/2 æ x=-(3+â5)/2ï¼y=(â5-3)/2
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