Inverse number is a mathematical term, which means that two numbers with equal absolute values and opposite signs are opposite to each other. The essence of opposites is that their absolute values are the same. For example, -2 and +2 are antonyms. The letters A and -a are opposites, and the opposite of 0 is 0. Here a is any number, which can be positive, negative or 0.

For example:? 1,-1 2, -2 3, -3 4, -4 and so on are antonyms.

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1. Antique features: If A and B are inverse numbers, A+B = 0; Otherwise, if a+b=0, a and b are inverse numbers.

The reciprocal of zero is 0.

3. Antiquities appear in pairs and cannot appear alone.

4. Distinguish between "opposite numbers" and "quantities with opposite meanings". "Inverse number" is not only the opposite sign of a number, but also the numbers after the sign must be the same, such as +5 and -5, while "quantities with opposite meanings" only need the opposite sign, such as +3 and -7.

5. To ask the reciprocal of a number, just add a negative sign in front of the number. If the original number is signed (whether positive or negative), it should be put in parentheses first.

6. the inverse of the number a is -a, and the inverse of -a is a, where a is not necessarily a positive number, so -a is not necessarily a negative number.

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