表达式由数据结构、绑定的变量（即具有值的变量）、数学操作符和函数调用组成。
The expression is composed of data structures, bound variables (that is, those with a value), mathematical operations and function calls.
在整数和浮点数上，都支持使用标准的数学操作符（+、-、/ 和 *），可以在算式中混合使用浮点数和整数。
The standard mathematical operators, +, -, /, * are supported on both integer and floating point values, and you can mix and match floating-point and integers in calculations.
不管怎样，数学操作符是不仅仅是你给出的操作符。有一些布尔型的操作符还能够帮助你用合理的思路或合理的逻辑判定。
However, mathematical operators are not the only operators you are given. There are Boolean operators to help you with logical circuits or logical decisions.
W3Eval的数学表达式由数字、变量、操作符、函数和括号组成。
Mathematical expressions in W3Eval are built of Numbers, variables, operators, functions, and parentheses.
操作符作为一种贴近数学符号的计算机语言元素，得到了绝大多数计算机程序设计语言的支持，大大方便了算法的实现。
Operators as a close to mathematical symbols computer language elements, get the most computer programming language support, greatly facilitate the realization of the algorithm.
操作符作为一种贴近数学符号的计算机语言元素，得到了绝大多数计算机程序设计语言的支持，大大方便了算法的实现。
Operators as a close to mathematical symbols computer language elements, get the most computer programming language support, greatly facilitate the realization of the algorithm.
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