lim(1+-) x→0 设 十 n n 1+ ln(n-1).1 n(n-1)…(n-n+1 2 1+1+,(1--)+…+ 饥(、 (-25.(1-2-1 n n n+1 =1+1+-( )+…+二(1 )(1 )…(1 n n n+2 n 十 n+相、2 (n+D(1 n n n+1二 e x x x + = → ) 1 lim(1 n n n x ) 1 设 = (1 +  + − = +  + 2 1 2! 1 ( 1) 1! 1 n n n n n ). 1 ) (1 2 )(1 1 (1 ! 1 ) 1 (1 2! 1 1 1 n n n n n n − = + + − ++ − −  − n n n n n n n 1 ! ( 1) ( 1)  − − + +  ). 1 ) (1 2 2 )(1 1 1 (1 ( 1)! 1 ) 1 1 ) (1 2 2 )(1 1 1 (1 ! 1 ) 1 1 (1 2! 1 1 1 1 + − + − + − + + + − − + − + + + − + = + + − + n n n n n n n n n n n xn   