英文字典中文字典51ZiDian.com

中文字典辞典英文字典 a b c d e f g h i j k l m n o p q r s t u v w x y z

安装中文字典英文字典辞典工具!

安装中文字典英文字典辞典工具!

Negative number - Wikipedia
Negative number Thermometer indicating a negative Fahrenheit temperature (−4 °F) In mathematics, a negative number is the opposite of a positive real number [1] Equivalently, a negative number is a real number that is less than zero Negative numbers are often used to represent the magnitude of a loss or deficiency
Square number - Wikipedia
For a non-negative integer n, the n th square number is n2, with 02 = 0 being the zeroth one The concept of square can be extended to some other number systems If rational numbers are included, then a square is the ratio of two square integers, and, conversely, the ratio of two square integers is a square, for example,
List of types of numbers - Wikipedia
Such a number is algebraic and can be expressed as the sum of a rational number and the square root of a rational number Constructible number: A number representing a length that can be constructed using a compass and straightedge
Square (algebra) - Wikipedia
Square (algebra) 5⋅5, or 52 (5 squared), can be shown graphically using a square Each block represents one unit, 1⋅1, and the entire square represents 5⋅5, or the area of the square In mathematics, a square is the result of multiplying a number by itself The verb "to square" is used to denote this operation
Square-free integer - Wikipedia
In mathematics, a square-free integer (or squarefree integer) is an integer that is divisible by no square number other than 1 That is, its prime factorization has exactly one factor for each prime that appears in it
Square root - Wikipedia
A positive number has two square roots, one positive, and one negative, which are opposite to each other When talking of the square root of a positive integer, it is usually the positive square root that is meant The square roots of an integer are algebraic integers —more specifically quadratic integers The square root of a positive integer is the product of the roots of its prime factors
Imaginary unit - Wikipedia
Square roots of negative numbers are called imaginary because in early-modern mathematics, only what are now called real numbers, obtainable by physical measurements or basic arithmetic, were considered to be numbers at all – even negative numbers were treated with skepticism – so the square root of a negative number was previously considered undefined or nonsensical The name imaginary is
−2 - Wikipedia
In mathematics, negative two or minus two is an integer two units from the origin, [1] denoted as −2 [2] or − 2 [3] It is the additive inverse of 2, positioned between −3 and −1, and is the largest negative even integer Except in rare cases exploring integral ring prime elements, [4] negative two is generally not considered a prime number [5] Negative two is sometimes used to denote