f(x是偶函数 丌 d x x4+x2+12√3 问:① d x 1+x 1+x2a/()= 奇点z=± 1+ f() 2)0 1+zQ f (x )是偶函数 1 2 3 0 4 2 2 p = + + ò ¥ dx x x x 问: ? 1 1 0 2 = + ò ¥ dx x ① ( ) z i z dx f z x = ± + = + ò ¥ - ¥ ,奇点 1 1 1 1 2 2 ( ) 0 1 1 1 1 2 2 ¾ ¾ ®¾ + = + × = z ® ¥ z z z z z f z