D. A variable is used for input while a constant is used for output. 相关知识点: 试题来源: 解析 B。变量和常量的主要区别是变量的值可以改变而常量不能。选项 A 变量和常量都可以存储数字和字符串;选项 C 常量和变量的声明位置不是主要区别;选项 D 变量和常量不是分别用于输入和输出。反馈 收藏 ...
What is a variable in research? A. A constant value. B. A factor that can change. C. A research method. D. A conclusion from research. 相关知识点: 试题来源: 解析 B。选项 A,变量不是常量值。选项 C,变量不是研究方法。选项 D,变量不是研究得出的结论。
A. A fixed number. B. A constant value. C. A value that can change. D. A known quantity. 相关知识点: 试题来源: 解析 C。在数学建模中,“variable”指的是一个可以变化的值。A 选项固定的数字不是变量;B 选项常量值不是变量;D 选项已知的量也不是变量。反馈...
解析 B。解析:在这个方程中,“x”是一个可以取不同值的量,这就是变量(variable)的定义。选项A,常数(constant)是固定不变的值,这里的“x”不是固定值。选项C,函数(function)是一种对应关系,这里不是函数的概念。选项D,系数(coefficient)是与变量相乘的数字,这里“x”不是系数。
An invariable quantity; a constant. Variable A quantity capable of assuming any of a set of values. Invariable Not liable to or capable of change; An invariable temperature An invariable rule His invariable courtesy Variable A symbol representing such a quantity. For example, in the expression a2...
Let's say we have a variable "xx." Its value can change depending on the context. For example, in analgebraic equationlike2x+3=72x+3=7, we can solve for "xx" by subtracting33from both sides of the equation. In this case, "xx" represents the unknown value we need to find. ...
An unchangeable value. The speed of light is a constant in physics equations. 11 Variables A storage location with a changeable value. The variable 'count' keeps track of the number of iterations in a loop. 8 Constant Declared with a specific value. We use a constant to represent the numbe...
Find the variable cost per unit: $10 ÷ 1,000 = $0.01 per unit Therefore, the variable cost per unit is $0.01. What is an example of a variable cost? An example of a variable cost is the cost of raw materials used to produce a product. The cost of raw materials will vary depen...
What is an example of a moderating variable? Moderating variables can be qualitative (non-numerical values like race, socioeconomic class or sex) or quantitative (numerical values like weight, reward level or age). For example: ...There may be a relationship between socioeconomic status and how...
In mathematics, a constant variable is a variable that has a constant value. That is, it is a variable, such that the value of that variable does not...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your...