十进制数的用法和样例：
例句
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用于表示十进制数的一种二进制编码的十进制码，其中每位十进制数用七位二进制数来表示，它们分别是8，6，4，2，0，1和0的系数。五－二码表如下：
A binary-coded decimal code for representing decimal numbers in which each decimal digit is represented by seven binary digits which are coefficients of8,6, 4,2, 0,1, 0, respectively.
