0.5 is a real number.

0.5是一个实数。

Any real number can be found on the real axis.

任何实数都可以在实轴上找到。

Can you give an example of a negative real number?

你能举出一个负的实数吗？

The square of any real number is non-negative.

任何实数的平方都是非负的。

Any real number can be located on the number line.

任何实数都可以在数轴上找到对应的位置。

In mathematics, a real number includes both rational and irrational numbers.

数学中，实数包括有理数和无理数。

Real number coding is adopted.

编码方式采用实数编码；

N.nn can be an integer or a real number.

nn 可以是整数或者实数。

The acceptability of real number system depends on practice.

实数系统的可接受性依赖于实践.

The norm of is defined as : where a is a real number

的模定义为：这里是一实数。