解析 B。解析:函数要求对于每个输入值(定义域中的值)有且只有一个输出值(值域中的值)。选项B中每个x值都对应唯一的y值。选项A中x = 1对应了两个不同的y值2和3;选项C中x = 2对应了两个不同的y值3和4;选项D中x = 1对应了两个不同的y值2和3,都不符合函数定义。
函数是对于每一个自变量,都有唯一的因变量与之对应。选项 A 中,自变量 1 对应了 2 和 3 两个不同的值,不是函数。选项 C 中,多个自变量对应了相同的因变量,是函数。选项 D 中,自变量 2 对应了 3 和 4 两个不同的值,不是函数。选项 B 中,每个自变量对应唯一的因变量,是函数。
Which of the following words is a functional word? ( ) A. Often B. Never C. Although D. Desk 你可能感兴趣的试题 单项选择题 高血压伴心率快的患者宜选用 A.卡托普利 B.硝苯地平 C.利血平 D.氢氯噻嗪 E.普萘洛尔 单项选择题 ( )属于耐寒性宿根花卉。 A. ...
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就是问你，那个选项能满足f(a+b)=f(a)+f(b)。把a+b和a、b分别带入等号两边，哪个相等哪个对...