(1)原式=( x2+x?2?x2 ?2x?1 (x+1)(x+2) )÷ x+3 (x+2)2 = ?(x+3) (x+1)(x+2) × (x+2)2 x+3 =- x+2 x+1 ;(2)原式=(2+ 3 +2- 3 )(2+ 3 -2+ 3 )=8 3 .