Introduction - If you have any usage issues, please Google them yourself
Expression calculator, includes a set of operations. Sample input can be adopted: 11.1+ 22.2 、 ln2 或 ln(2) 、 pow(2,4) 、 2*(1+31/3.1) 、 2+ sum([sin30,3+4,6,sum([sum([sum([1,2,3]),2,3]),2,3])])+4*3