精确值为。

1)编制按从大到小的顺序，计算SN的通用程序。

2)编制按从小到大的顺序，计算SN的通用程序。

3)按两种顺序分别计算,并指出有效位数。（编制程序时用单精度）

4)通过本次上机题，你明白了什么？-Exact value. 1) prepared in descending order, the calculation SN general procedure. 2) prepared in accordance with the order　small to large, general-purpose computing SN procedure. 3) Press both orders were calculated and noted significant digits. (When programmed with a single precision) 4) by this question on the plane, you know what?