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> 函数中自变量的取值范围是_______________.-九年级数学
函数中自变量的取值范围是_______________.-九年级数学
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
函数
中自变量
的取值范围是_______________.
题型:填空题
难度:偏易
来源:不详
答案
x<1
根据二次根式的性质和分式的意义,被开方数大于或等于0,分母不等于0,可以求出x的范围.
解:根据题意得:1-x>0,
解得:x<1.
故答案为:x<1.
本题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.
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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:1-x>0,
解得:x<1.
故答案为:x<1.
本题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.