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    【题目】The letter “X” often represents an ________ (know) number in some Math exercises.

    【答案】unknown

    【解析】

    句意：在一些数学练习中，字母“X”通常表示一个未知的数字。

    根据“The letter “X” often represents”可知，这里是说字母“X”表示一个未知数字。这里是形容词作定语，所给单词know，动词，知道，这里用形容词unknown，不知道的，未知的。故答案为unknown。

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