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本文针对初中数学中“+”号和“-”号产生的背景和不同背景下的不同含义、读法、以及它们含义的相互转化进行研究。通过具体的数学问题情境来说明“+”号和“-”号的含义和运用:若作为性质符号,它们分别是“正”号和“负”号,读作“正”和“负”、若作为运算符号,它们分别是“加”号和“减”号,读作“加”和“减”;在运算中,若看成性质符号就要参与运算、若看成运算符号就不参与运算,而是指明了运算方式。
In this paper, we will study the different meanings and reading methods of “+” and “-” in junior middle school mathematics and the mutual transformation of their meanings. Explain the meaning and application of “+ ” and “- ” numbers through specific mathematical problem situations: If they are character symbols, they are “positive” and “negative” “Plus ” and “minus ”, if used as an operation symbol, they are respectively “plus” and “minus”, read as “plus” and “minus” If we regard the symbol of nature, we must take part in the operation. If we regard it as an operation symbol, we will not participate in the operation, but will specify the operation method.