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题目简介
函数的自变量x的取值范围是▲.-九年级数学
题目详情
答案
解:根据题意得:x-1≥0,解得,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