英语翻译若函数y=根号下[(a²-1)x²+(a-1)x+2/(a+1)]的定义域为R,求实数a的取

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英语翻译
若函数y=根号下[(a²-1)x²+(a-1)x+2/(a+1)]的定义域为R,求实数a的取值范围.
①a²-1=0,即当a=1时,不等式为2/2=1>=0恒成立,所以a=1符合题意.
②当a²-1≠0时必须……(不好打,省略了^-^)
综上所述,所求a的范围是[1,9]
1个回答 分类:数学 2014-10-05

问题解答:

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If the function y = root under [(a ² -1) x ² + (a-1) x +2 / (a ​​+1)] of the domain of R,the number of a realistic range of values.
Solution:① a ² -1 = 0,that is,when a = 1,the inequality 2 / 2 = 1> = 0 always true,so a = 1 line meaning of the questions.
② When a ² -1 ≠ 0 must ...seek a range of [1,9]
 
 
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