题目内容

【题目】若一系列函数的解析式相同，值域相同，但定义域不同，则称这些函数为“孪生函数”，那么函数解析式为y＝2x2－3，值域为{1，5}的“孪生函数”共有（ ）

A．10个 B．9个 C．8个 D．4个

【答案】B

【解析】由2x23＝1,2x23＝5得x的值为1，1,2，2，定义域为2个元素的集合有4个，定义域为3个元素的集合有4个，定义域为4个元素的集合有1个，因此共有9个“孪生函数”．

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