Number-to-number representation: first represent columns, and then represent rows. Enclose numbers or letters representing columns and rows in parentheses, and then separate them with commas.
Function of number pairs: number pairs can indicate the position of objects and also determine the position of objects.
Two pairs of numbers, the former one being the same, indicate that the objects they represent are in the same column. For example, (3,6) and (3,7) are in the third column.
Two pairs of numbers, the latter being the same, indicate that the positions of the objects they represent are on the same line. For example, (3,6) and (5,6) are in the sixth row.
Ordered real number pair A number pair consisting of two real numbers A and B in turn is called an ordered real number pair. The most typical ordered real number pair is the coordinate of the plane rectangular coordinate system. The arrangement order of two real numbers will affect the operation result.
Ordered real number pairs actually represent a point, and they correspond to each other. In a set, an ordered real number pair represents an element. For example, the set {(X, Y)|(5, 6)} is a single-element set, where x and y are ordered real number pairs, representing the numbers at that point in the coordinate system.
A real number pair refers to two real numbers A and B. A real number pair must have two real numbers to be determined. When a≠b, (a, b)(b, a) are two different pairs of real numbers.