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1·The letter x often represents an unknown number in some Math exercises.

在一些数学练习中，字母“x”通常代表一个未知数。

2·An unknown number of demonstrators were arrested.

不知多少示威者被逮捕了。《柯林斯英汉双解大词典》

3·The sign X denotes an unknown number.

符号表示一个未知数。

4·The sign X stands for an unknown number.

在代数中，符号x通常代表一未知数。

5·In math, X is used to stand for an unknown number.

在数学中，X被用来代表一个未知数。

6·The unknown number can be calculated from the data.

通过已知数可以算出未知数。

7·Write out the equality that contains unknown number.

列出含有未知数的等式。

8·An unknown number drowned in the floodwaters or died later of injuries.

被洪水淹死及受伤后死去的宠物数量至今还不清楚。

9·They have an unknown number of binary digits, which you cannot control.

他们有数目不详的二进制数字，你无法控制。

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

如果要想求出未知数，你首先得知道已知数。

未知数

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

如果要想求出未知数，你首先得知道已知数。

2·In math, X is used to stand for an unknown number.

在数学中，X被用来代表一个未知数。

3·Write out the equality that contains unknown number.

列出含有未知数的等式。

4·The sign X stands for an unknown number.

在代数中，符号x通常代表一未知数。