fall in maths.math为什么要加s

fall in maths.math为什么要加s maths homework为什么math加s?math homework对吗? The maths problem is too difficult.math为什么加s Maths/Math（数学）到底是否要加s?Math和Maths到底哪个对? 请问：Can you work out this maths problem 为什么math要加s? maths为什么要加s I think maths is important than english.为什么math加S this maths problem.为什么加s 1.Math lessons ,lesson为什么加s? 为什么math和maths都是数学 My maths is just a mess. 为什么加s this maths problem.为什么加s this是单数啊