除数与被除数

Addition, subtraction, multiplication and division are the four basic arithmetic operati*** done in the set of real numbers. Division is the inverse operation of multiplication. For example, and therefore, . Unlike the other three operati***, division is not closed in the set of integers. For example,    is not an integer. In other words, sometimes a remainder is left when a number is divided by another. To make the operation of division complete, the number system is extended from the set of integers to the set of rational numbers.

在整数集合中，除法在除法中起着重要作用。它说对于每个整数a，b（≠0），存在唯一的整数q和r，使得a=bq+r，其中0≤q≤| b |。例如，取a=5和b=2，q和r的唯一值分别为2和1，即5=2*2+1。这表明，当5除以整数集中的2时，答案是2，剩下的是1的余数。

But in the set of real numbers the division there is no remainder. Let a, b (≠0) be two real numbers, then  if and only if  

什么是除数？

C***ider the number b dividing the number a, i.e. . The number a is divided by the number b. Since, number b is the number by which another number is divided, it is called the divisor – the doer of the division. For example c***ider the case of dividing 5 by 2. Then, the divisor is 2. A very important thing to note about the divisor is that it is non-zero. It is because division by 0 is not-defined.

什么是红利？

考虑前面例子中的例子。在这里，a是被b除的数-除数。将要被除的数a叫做被除数。在5除以2的例子中，5是股息。

因此，在除法算法中，a是被除数，b是除数。