原式= x+2+x?2 (x+2)(x?2) ÷ 2x x+2 = 2x (x+2)(x?2) ? x+2 2x = 1 x?2 ,∵x-2≠0,x+2≠0,x≠0,∴x≠2,x≠-2,x≠0,即x= 3 ,当x= 3 时,原式= 1 3 ?2 = 3 +2 ( 3 ?2)( 3 +2) =- 3