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.2=-九年级数学
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函数中,自变量的取值范围是.-九年级数学
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题目简介
函数中,自变量的取值范围是.-九年级数学
题目详情
答案
解:根据题意得:3-x≥0且x-1≠0,解得:x≤3且x≠1
本题考查的是函数自变量取值范围的求法.函数自变量的范围一般从三个方面考虑:
(1)当函数表达式是整式时,自变量可取全体实数;
(2)当函数表达式是分式时,考虑分式的分母不能为0;
(3)当函数表达式是二次根式时,被开方数为非负数.