å¦å¾ï¼|x/2+a| = 1/2*|x-(-2a)| æ¯è¿ï¼-2aï¼0ï¼ç两æ¡å°çº¿ï¼æçåå«ä¸º -1/2ã1/2ï¼
å½ x^2-x+3 = -(x+2a)/2 æ¶ï¼2x^2 - x +6+2a = 0ï¼
令å¤å«å¼ = 0å¾ 1-8(6+2a) = 0ï¼è§£å¾ a = -47/16ï¼
å½ x+2/x =(x+2a)/2 æ¶ï¼x^2 - 2ax + 4 = 0ï¼
令å¤å«å¼ = 0 å¾ 4a^2-16=0ï¼è§£å¾ a = 2ï¼èå» -2ï¼ï¼
å æ¤ a èå´ä¸º [-47/16ï¼2] ã