2
9
+
(   )
9
8
9
                       
2
11
+
(   )
11
+
5
11
<1.
分析:根據(jù)不等式的性質(zhì)進(jìn)行解答.
解答:解:(1)設(shè)這個(gè)數(shù)是x,
2
9
+
x
9
8
9
,
  
x
9
8
9
-
2
9

   
x
9
6
9
,
    x<6;
小于6的非零自然數(shù)是1、2、3、4、5.

(2)設(shè)這個(gè)數(shù)是x,
2
11
+
x
11
+
5
11
<1,
       
x
11
<1-
2
11
-
5
11
,
       
x
11
4
11

          x<4.
小于4的非零自然數(shù)是1、2、3.
故答案為:1、2、3、4、5,1、2、3.
點(diǎn)評(píng):本題主要考查了學(xué)生根據(jù)不等式的性質(zhì)解不等式的能力.
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