1. We can quickly type out mathematical symbols by copying, which is very practical. You can also enter some special mathematical symbols.

2. Mathematical symbols can also be quickly input through the input method. In this way, there will be a special symbol tool in each input method, and you can type it in it. Taking QQ input method as an example, the effect is as follows.

3. If you think the above two methods are troublesome, you can also directly select mathematical symbols in the special symbol online tool. There is this tool below, and we can operate it directly.

Development course:

For example, there used to be several kinds of plus signs, and the "+"sign is commonly used in modern mathematics. "+"comes from Lavin "et" (meaning "harmony").

/kloc-in the 6th century, Italian scientist Nicolo Tartaglia used the first letter of Italian word "plu" (meaning "add") to indicate addition, and the grass was "μ", which finally became "+". The number "-"is derived from the Latin word "minus" (meaning "minus"). It was abbreviated to M at first, but later it was simplified to "-"because it was written quickly.