What is the meaning of different names and different names

The difference is subtracted by two numbers.

Referring to the famous mathematical treatise "Nine Chapters of Arithmetic" (written in the first century AD) in ancient China, the law of addition and subtraction of positive and negative numbers was first proposed: "Positive and negative numbers are said: the same name is divided, different names are beneficial, positive and negative are not negative, and negative is not positive; Its different names are divided by each other, the same name is beneficial, the positive is not into the positive, and the negative is not into the negative.

The "name" here is the "number", the "division" is "subtraction", the "benefit" and "division" are the absolute values of the two numbers "add" and "subtract", and "none" is "zero".

In today's words: "The law of addition and subtraction of positive and negative numbers is: the subtraction of two numbers with the same sign is equal to the subtraction of their absolute values, and the subtraction of two numbers with different signs is equal to the addition of their absolute values."

Zero minus positive numbers gives negative numbers, and zero minus negative numbers get positive numbers. The addition of two numbers with different signs is equal to the subtraction of their absolute values, and the addition of two numbers with the same sign is equal to the addition of their absolute values. Zero plus a positive number equals a positive number, and a zero plus negative number equals a negative number. ”

Subtraction: When encountering the same symbol, the number should be subtracted from its value, and the number of the different symbols should be added to its value, the difference between zero and positive numbers is negative, and the difference between zero and negative numbers is positive.

What kind of math is it about?

Subtraction: In case of disadvantages, the number of the same symbol should be subtracted from its value, and the number should be added to the value of the different symbol, the difference between zero and positive numbers is negative, and the difference between zero and negative numbers is positive.

It is talking about the law of subtraction of positive and negative numbers, which means: the subtraction of two numbers with the same sign is equal to the subtraction of the pair of their absolute limbs; The defeat of the two numbers of different signs makes the child decrease, which is equal to the addition of their absolute values; Zero minus positive numbers to get negative numbers, and zero minus negative numbers to get positive numbers.

Each magnet has a magnetic field, which can be imagined as a line from the n pole to the s pole, if it is the same level, the magnetic field lines cannot be connected together, so they are repulsive; If it is synonymous, the magnetic field lines can be connected together, so they attract.

The laws of nature do not need to be verified by reasoning.

I'm just rote. It seems to have something to do with the geomagnetic field.

Magnets of the same material can only be attracted by the poles of the same name, and the poles of the same name are repelled by the poles.

However, it is different between magnets made of different materials.

A ferrite magnet, or magnetized steel, can attract magnets of other materials that are stronger than its own magnetic force. This is actually the use of the attraction of these non-ferrite and steel magnets to iron greater than the repulsion of the poles of the same name between them, suppressing the weak magnetic field.

The Law of Attraction丨The magical personal magnetic field effect 1: the same attracts and the different repels each other.

+a)+(b)=+a+b)

I think it should be this! Hope!