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【题目】下列四个说法:

若定义域和对应关系确定,值域也就确定了

②若函数的值域只含有一个元素,则定义域也只含有一个元素;

③若fx=5xR,则fπ=5一定成立;

函数就是两个集合之间的对应关系

其中正确说法的个数为

A1 B2 C3 D4

【答案】B

【解析】正确;②不正确如函数fx=0xR,值域为{0},只含有一个元素,但是定义域中可能含有无数个元素正确④不正确函数是定义在两个非空数集上的对应关系

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