数学的单词是mathematics。mathematics的；例句：once you understand the mathematics of debt you can work your way out of it（一旦掌握了债务计算，你就能迎刃而解）。

mathematics的例句：Most of the students in this class are good at mathematics（这个班的学生多半数学很好）；Mathematics and astronomy are cognate sciences（数学和天文学是互相关联的科学）。