For example, the reciprocal of √7 is1√ 7 =1√ 7 = 7 √ 7.
The reciprocal of cube root √-8 is: 1 ÷ (cube root √-8) =1(-2) =-1/2.
I. Countdown
Two numbers whose product is 1 are reciprocal.
The reciprocal (dào shù) means that a number is set mathematically, and its product x is 1, which is recorded as 1/x, and the process is "multiplication inversion". All numbers except 0 have reciprocal, and the numerator and denominator are inverted. The two products are 1, and 0 has no reciprocal.
Second, the method of finding the reciprocal of a number
To find the reciprocal of a fraction, say 2/3, we just need to exchange the numerator and denominator of this fraction, that is, the reciprocal of 2/3 is 3/2.
To find the reciprocal of an integer, we only need to regard this integer as a fraction with the denominator of 1, and then find the reciprocal of this fraction. For example, 5, that is, 5/ 1, and then the numerator and denominator of 5/ 1 are both numerators, so there is 1/5, that is, the reciprocal of 5 is 1/5.
In the process of finding the reciprocal, the reducible offer score, such as 6/ 15, becomes 2/5 after reduction. Finally, the numerator and denominator are switched to get 5/2, which is the reciprocal of 6/ 15.
Description: The reciprocal number itself is 1 and-1, the reciprocal of positive number is positive, the reciprocal of negative number is negative, and 0 has no reciprocal; So two numbers whose product is 1 are reciprocal.