主题：新手请教问题,请各位老师指导一下

Dim d As Double
Dim s As String
s = "Vars("chan")+5" 

d = s  '请教这里要怎么写,才能正确计算? '注:Vars("chan")是一个全局变量浮点型,也就是怎么让字符串变为表达式进行计算

Dim d As Double
Dim s As String
s = "100+5/3" 

d = s 怎么让字符串变为表达式进行计算

Dim d As Double
Dim s As String
s = "Vars(""chan"")+5" 

d = Eval(s)