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【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=2x23,值域为{1,5}的“孪生函数”共有

A10个 B9个 C8个 D4个

【答案】B

【解析】由2x231,2x235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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