Negative numbers are antonyms of positive absolute values. Any positive number preceded by a negative sign is equal to a negative number. On the number axis, all negative numbers are on the left of 0, and all negative numbers are less than natural numbers. Negative numbers are marked with the minus sign "-". There are countless kinds of positive numbers, including positive integers, positive fractions and positive irrational numbers. Geometric meaning of positive numbers: all points representing positive numbers on the number axis are on the right side of 0 on the number axis.
sign symbol
"Add or subtract" means positive or negative, and symbols can be used to represent the positive or negative of rational numbers, or to add and subtract logarithms in four operations. Symbol is not a single concept in middle school physics. Some symbols are equivalent to rational numbers in mathematics, while others are used to express the nature and direction of physical quantities. The situation is more complicated.
In mathematics, if |a|=2 (absolute value), the actual value of a is 2. Numbers greater than 0 are called positive numbers. Positive numbers are usually preceded by a "+"symbol, which can usually be omitted. There are countless kinds of positive numbers, including positive integers, positive fractions and positive irrational numbers. Numbers less than 0 are called negative numbers, and negative numbers and positive numbers represent quantities with opposite meanings. Negative numbers are marked with a negative sign "-"and a positive number.
Refer to the above content: Baidu Encyclopedia-plus sign or minus sign