3是有理数吗
你知道“理性”这个词是怎么来的吗？它的名字来源于“比率”这个词。因此，有理数与比率的概念密切相关。有理数是我们在数学中仅次于整数的最普遍的数字类型之一。
什么是有理数？
有理数的形式是 p/q，其中 p 和 q 是整数，q ≠ 0。由于数字的基本结构，p/q 形式，大多数人发现很难区分分数和有理数。当一个有理数被除法时，输出是十进制形式，可以是结束也可以是重复的。 3、4、5 等是有理数的一些示例，因为它们可以用分数形式表示为 3/1、4/1 和 5/1。
什么是无理数？
不能表示为简单分数的实数称为无理数。它不能表示为像 p/q 这样的比率，其中 p 和 q 都是整数。这是有理数的不一致。在小数点之后，无理数有无限数量的非重复数字。 √2、√3、√5 等是无理数的一些例子，因为它们不能以 p ⁄ q 的形式表示。
3是有理数吗
回答：
Rational numbers are one of the most prevalent types of numbers that we learn in math after integers. A rational number is a sort of real number that has the form p/q where q≠0. All whole numbers, natural numbers, fractions of integers, integers, and terminating decimals are rational numbers.
When a rational number is split, the result is a decimal number, which can be either a terminating or a recurring decimal. All rational numbers can be expressed as a fraction whose denominator is non-zero. Here, the given number, 3 can be expressed in fraction form as 3⁄1. Hence, it is a rational number.
类似问题
问题一：√7是有理数还是无理数？
回答：
A rational number is a sort of real number that has the form p/q where q≠0. When a rational number is split, the result is a decimal number, which can be either a terminating or a recurring decimal. Here, the given number, √7 cannot be expressed in the form of p/q. Alternatively, 7 is a prime number. This means that the number 7 has no pair and is not divisible by 2. Hence, √7 is an irrational number.
问题 2：判断 3/2 是否为有理数。
回答：
A rational number is a sort of real number that has the form p/q where q≠0. When a rational number is split, the result is a decimal number, which can be either a terminating or a recurring decimal. Here, the given number is expressed in the form of p/q and its value is 1.5 which is terminating. Hence, 3/2 is a rational number.
问题3：√9是有理数还是无理数？
回答：
A rational number is a sort of real number that has the form p/q where q≠0. When a rational number is split, the result is a decimal number, which can be either a terminating or a recurring decimal. Here, the given number, √9 can be expressed in the form of p/q as it is equal to 3. Alternatively, 9 is not a prime number. This means that the number 9 is divisible by 3. Hence, √9 is an irrational number.
问题4：确定是否-0.6666……。是一个有理数。
回答：
A rational number is a sort of real number that has the form p/q where q≠0. When a rational number is split, the result is a decimal number, which can be either a terminating or a recurring decimal. Here, the given number is expressed in the form of p/q and has recurring decimal. Hence, -0.6666….. is a rational number.