If the integer is negative, you write a minus sign before the number, just as in mathematics.

如果是一个负数，在数字前面加上“-”即可，就和数学中是一样的。

A printed or written sign used to represent an operation, an element, a quantity, a quality, or a relation, as in mathematics or music.

符号，代号：印刷的或书面的符号，用来代表某一操作、要素、数量、质量或某种联系，如在数学或音乐中。

The rapid development of the information technology with the sign of multi-media computer And the Internet communication must bring forth the complete change in teaching mathematics in middle school.

以多媒体计算机和网络通信技术为标志的信息技术的飞速发展，必然会引起中学数学教学的全面变革。