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下列函数中自变量x的取值范围是x>1的是().A.B.C.D.-八年级数学
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题目简介
函数的自变量x的取值范围是.-八年级数学
题目详情
答案
解答:解:根据题意得:1-x>0,
解得:x<1.
故答案为:x<1.
点评:考查了函数自变量的取值范围,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,被开方数非负.