A positive number greater than 0 is called a positive number, usually preceded by a symbol "+",which can usually be omitted. On the number axis, all positive numbers are on the right side of 0. There are countless kinds of positive numbers, including positive rational numbers and positive irrational numbers. Positive rational numbers include positive integers and positive fractions. Geometric meaning of positive numbers: all points representing positive numbers on the number axis are on the right side of the origin on the number axis. ?
A negative number less than 0 is called a negative number, which is marked with a negative sign "-"and a positive number. On the number axis, all negative numbers are to the left of 0. A negative number is the reciprocal of its absolute value. Comparing the sizes of two negative numbers, the absolute value is larger but smaller. Geometric meaning of negative numbers: all points representing negative numbers on the number axis are on the left of the origin on the number axis.
On the number axis, all positive numbers are on the right side of 0, and the earliest record of positive numbers is China's ancient mathematical work "Nine Chapters Arithmetic". In the calculation, it is stipulated that the positive calculation is red and the negative calculation is black, that is, the red calculation represents positive numbers and the black calculation represents negative numbers. Comparing the sizes of two negative numbers, the absolute value is larger but smaller.
A negative number is the reciprocal of its absolute value. On the number axis, negative numbers are all on the left of 0, and the earliest record of negative numbers is China's ancient mathematical work "Nine Chapters Arithmetic". In the calculation, it is stipulated that the positive calculation is red and the negative calculation is black, that is, the red calculation represents positive numbers and the black calculation represents negative numbers. Comparing the sizes of two negative numbers, the absolute value is larger but smaller.
The meaning of positive and negative numbers:
Positive and negative numbers are a way to express numerical relations, reflecting the differences in quantity and direction of things described. Simply put, a positive number means increase, growth and surplus, and a negative number means decrease, decrease and loss.
In mathematics, a positive number means a number greater than zero and a negative number means a number less than zero. On the number axis, the center is zero, the right side is positive, and the left side is negative. When a number is located on the right side of the number axis, its absolute value is larger; On the contrary, the farther to the left, the greater the absolute value.
In real life, we often have to deal with positive and negative numbers. For example, the symbol of the temperature value indicates how much the temperature is higher or lower than the standard temperature, the symbol of the account balance indicates how much the account balance is overspent or surplus, and the symbol of the company's profit and loss indicates how much the company gains or loses.