说明：  　如果你是第一次使用Mathematica，那么以下几点请你一定牢牢记住： Mathematica中大写小写是有区别的，如Name、name、NAME等是不同的变量名或函数名。 系统所提供的功能大部分以系统函数的形式给出，内部函数一般写全称，而且一定是以大写英文字母开头，如Sin[x],Conjugate[z]等。 乘法即可以用*，又可以用空格表示，如2 3＝2*3＝6 ,x y,2 Sin[x]等；乘幂可以用“^”表示，如x^0.5,Tan[x]^y。
(If you are a first time using Mathematica, then you must ask the following points firmly in mind: Mathematica is a difference between uppercase lowercase, such as Name, name, NAME, such as a different variable name or function name. Most functions provided by the system is given in the form of system functions, internal functions generally write the full name, and must start with an English letter in uppercase, such as Sin [x], Conjugate [z] and so on. Multiply that you can use*, but also expressed by spaces, such as the 2 3 = 2* 3 = 6, xy, 2 Sin [x], etc. exponentiation can use the "^", such as x ^ 0.5, Tan [x] ^ y.)