The product of two real numbers is 1, so these two numbers are reciprocal. For example, if two times one-half equals one, then two is the reciprocal of one-half, and one-half is also the reciprocal of two.

Reciprocal means to set a number mathematically, and its product X is 1, which is recorded as 1/X. The process is "multiplication inversion". All numbers except 0 have reciprocal, and the numerator and denominator are in opposite phases. The two products are1,and 0 has no reciprocal.

Reciprocal can generally be used to represent the multiplication inverse of numbers, and it is generally used in multiplication groups composed of congruence classes of rational numbers, real numbers, complex numbers and modulo n.

Reciprocity method

1, reciprocal of true and false scores: exchange numerator and denominator, that is, reciprocal of true and false scores.

2. The reciprocal of an integer: the integer is the denominator, and 1 is the numerator. Is the reciprocal of an integer.

3. Reciprocal of decimals: For the reciprocal of divisible numbers, you can divide by 1 to find the reciprocal; for uncountable numbers, you can convert the number of components, and then find the reciprocal according to the method of true and false fractions.