“＋、-”这两个符号最早用于商业，分别表示“盈余’”和“不足”，那么“＋、一”作为加减运算符号始于何时呢？根据历史记载，公元1498年在一位德国数学家所著的数学书中首先使用了“＋”和“一”号．但当时并没有被人们公认为加减运算符号而加以应用．时隔十六年，直到1514 The two symbols “+, -” were earmarked for commerce, representing “surplus” and “insufficiency” respectively. Then, when is the “+, a” as an addition and subtraction symbol? According to historical records, the “+” and “I” symbols were first used in a mathematical book written by a German mathematician in 1498 AD. However, it was not commonly used as an addition or subtraction operator. 16 years later, until 1514