估算：的值（）. （A）在5和6之间（B）在6和7之间（C）在7和8

估算：的值（）.

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估算：的值（ ）. （A）在5和6之间 （B）在6和7之间（C）在7和8

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估算：的值（）. （A）在5和6之间（B）在6和7之间（C）在7和8