通过已知数可以算出未知数。

The unknown number can be calculated from the data.

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如果要想求出未知数，你首先得知道已知数。

If you want to get the unknown number, you should know the known number first.

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如果要想求出未知数，你首先得知道已知数。

If you want to get the unknown number, you should know the known number first.

youdao