摘要：21．(1)935.7.859.0,······································································································ (2)解:2004~2008移动电话年末用户逐年递增． 2008年末固定电话用户达803.0万户．······················································· (注:答案不唯一.只要符合数据特征即可得分)
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把一个数x立方后得x3，如下表：
请观察上面表格中的数据并求值：则
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| x | 1.1 | 1.2 | 1.3 | 1.4 | 1.5 | 1.6 | 1.7 | 1.8 | 1.9 |
| x3 | 1.331 | 1.728 | 2.197 | 2.744 | 3.375 | 4.096 | 4.913 | 5.832 | 6.859 |
| x | 1.811 | 1.812 | 1.813 | 1.814 | 1.815 | 1.816 | 1.817 | 1.818 | 1.819 |
| x3 | 5.9396 | 5.9494 | 5.9593 | 5.9691 | 5.9790 | 5.9889 | 5.9988 | 6.0087 | 6.0186 |
| 3 | 6 |
1.82
1.82
．（保留三位有效数字）