Вопрос: In conclusion, logarithmic tables were an important computing tool in the past, and their use helped ... complex calculations.

The prompt seems to be incomplete as it ends with 'helped ... complex calculations.' To provide a complete answer, the missing word or phrase is needed. However, based on the context of logarithmic tables being a computing tool, the missing word would likely relate to simplifying or performing these calculations.

If the sentence were complete, it would likely read something like:

In conclusion, logarithmic tables were an important computing tool in the past, and their use helped simplify complex calculations.

Or:

In conclusion, logarithmic tables were an important computing tool in the past, and their use helped perform complex calculations.