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。
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