How do the plus and minus signs come about? How to play plus and minus signs together

You'd have to go back to n years ago

The plus and minus signs together are plus or minus and are played as follows:

The first type: switch the computer input method to the Sogou input method - Chinese input, and then enter the plus and minus signs - zhengfuhao, and the symbol will appear.

The second type: Find it in the symbol encyclopedia of Sogou input method. The specific steps are as follows:

1、Switch the computer input method to the Sogou input method。

2. Place the mouse cursor anywhere in the status bar of Sogou input method, and then click the right mouse button.

3. On the pop-up page, click "Emoji > Symbols".

4. Then click "Symbols".

5. After entering the encyclopedia of symbols, click on the left to count the fourth - mathematical unit, and then select on the right, and click it with the left mouse button to enter.

Open the input method, in the software disk, find the mathematical symbol q position is

There are special characters in the Sogou input method.,That can be typed out for adoption.。

The plus sign above and the minus sign below are " " for positive or negative. Input Method:

Method 1, 1, use the Sogou input method, find the status bar, and then right-click;

2. Find the emoji in the status bar, then click to open it;

<> method 2: 1. Right-click on the status bar of Sogou input method, and find the soft keyboard - special symbols;

2. Click to open the special symbol, find the " " sign from the pop-up soft keyboard, and click it when you use it.

Hint: Positive and negative signs can be used in mathematics to represent the positive and negative of rational numbers or to add and subtract from the four operations on numbers. Positive and negative signs are not a single concept in middle school physics, some of them are equivalent to the positive and negative of rational numbers in mathematics, and some are used to express the nature and direction of physical quantities, and the situation is more complicated.

Summary. Why does the minus sign become a plus.

Among them, Danchai -(143-67) = 143+67 is because of the formula of de-parentheses, the parentheses are preceded by a minus sign, and after the brackets are removed, the symbol "+" "change" - "change fortune" + "type late beam.

The parentheses are preceded by a plus sign, and after the parentheses are removed, the symbol "+" becomes "+" + "changes" -".

According to this theorem, we can understand why the minus sign becomes the plus sign.

I hope you understand.

, the name plus or minus signs, the general table is the error range.

In mathematics, such as |a|=2 (absolute) then the actual value of a is 2. Numbers larger than 0 are called positive numbers, and there is often a symbol "+" in front of positive numbers, which can usually be omitted and not written, and there are countless positive numbers, including positive integers, positive fractions, and positive irrational numbers. A number smaller than 0 is called a negative number, and a negative number and a positive number represent a quantity with opposite meanings.

Negative numbers are marked with a negative sign " " and a positive number.

In physics, plus and minus signs are not a single concept, and the number of cars is sometimes used in physics to be equivalent to the plus and minus of rational numbers in mathematics, and sometimes the plus and minus signs are used to indicate the nature and direction of physical quantities.

The meaning of positive and negative signs in electrostatics.

1. The Coulomb force (electric field force) and the electric field strength are vectors, and their plus or minus signs indicate whether their direction is the same (+) or opposite to the specified positive direction.

2. The work done by the electric field force is a scalar quantity, and its positive and negative signs indicate whether the direction of the electric field force and the displacement is the same or opposite, and its absolute value indicates the amount of work.

3. The amount of charge is a scalar quantity, and its positive and negative signs indicate the electrical properties of the charge ("+ indicates positive charge," indicates negative charge), and the magnitude of the charge amount is the absolute value of the amount of charge.

4. The electric potential is also a scalar quantity, and its positive and negative signs indicate that the big town sail is small, and the negative potential is always lower than the positive potential.

It can be seen that the positive and negative signs in electrostatics do not indicate magnitude (high and low) in many cases, but have other specific meanings.

When we were learning mathematics, we often dealt with mathematical symbols such as "+", and as the days went by, we became good friends with them every day. But do you know where these friends come from? Speaking of age, the plus sign "+" and the minus sign "-" are considered big brothers.

500 years ago, there was a German mathematician named Weidmann, who added a vertical to the horizontal line to indicate the meaning of increase; Remove a vertical on the plus sign to indicate a decrease. Thus the two brothers "+" and minus "-" were born. However, it was officially recognized as a symbol for addition and subtraction until 1514, when the Dutch mathematician Hojck began to do so.

The equal sign "=" is younger than the age of the two of them. More than 400 years ago, the British scholar Codd felt that it was most appropriate to use two parallel and equal straight lines to represent the equality of two numbers.