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运算 - Wikipedia

运算

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数学上,运算是一种行为,通过已知量的可能的组合,获得新的量。例如,算术中的加法 5 + 3 = 8,这里 5 和 3 是输入,8 是结果,而加号“+”表明这是一个加法运算。常见的运算包括加法乘法,开方等等。

运算顺序:在同一个式子里,先乘方、开方再乘、除最后加、减。有括号时从最里面的括号开始算起,依次去掉括号。

只接受一个输入的运算,称为一元运算,包括逻辑非,开方等。集合 S 上的一元运算就是函数 SS

接受两个输入的运算,称为二元运算。包括算术中的集合论中的笛卡尔积等。二元运算是抽象代数的重要研究对象,包括对其交换律结合律的研究。

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