Integer mean ... -2,- 1,0, 1,2,3. ...
Fractions are the quotient of integers, for example, 2/3 (two-thirds) is actually 2 divided by 3.
Percent is a generalized fraction, which allows that the numerator is not an integer and the denominator is always 100. For example, 3.2% is 3.2/ 100, which means 3.2 divided by 100.
Decimal is a number containing a decimal point, which consists of an integer part to the left of the decimal point and a decimal part to the right of the decimal point. For example, in 3. 12, 3 is an integer part, and decimals are divided into finite decimals, such as 3.12; Infinitely cyclic decimal, such as 3. 122222. .....
There are infinite cyclic decimals, such as pi = 3. 14 15926535. ......
Real numbers refer to all decimals.
Finite decimal or infinite cyclic decimal is a rational number.
Infinitely cyclic decimals are irrational numbers, such as π, √2.
Rational numbers and fractions represent the same category.
In other words, every rational number can be written as a fraction.
And each fraction can also be written as a finite decimal or an infinite cyclic decimal.
Real numbers greater than zero are called positive numbers, and real numbers less than zero are called negative numbers.
Zero is neither positive nor negative.
The imaginary unit I is defined as I 2 = 1. It is obtained by multiplying a nonzero real number b by i.
The number of is called imaginary, so I, 2i, -3i ... are all imaginary.
Numbers like a+bi are called complex numbers, where a and b are both real numbers.
Such as 1+i, 2-3i, 4+√5i. ...
Real and imaginary numbers are special complex numbers;
When b=0, A+bi is a real number,
When a=0, b≠0 is an imaginary number.