已知f(x)是定义域在[-1,1]上是增函数,且f(x―1)<f(x2―1),求x得取值...
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发布时间:2024-10-16 05:08
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热心网友
时间:2024-10-29 04:41
是增函数
定义域在[-1,1]
所以-1<=x-1<x²-1<=1
-1<=x-1
x>=0
x-1<x²-1
x(x-1)>0
x<0,x>1
x²-1<=1
-√2<=x<=√2
所以
1<x≤√2
热心网友
时间:2024-10-29 04:38
定义域在[-1,1]上是增函数,且f(x―1)<f(x2―1),所以有:
x-1≥-1 ``````````````````````````1
x-1<x^2-1``````````````````````2
x^2-1≤1`````````````````````````3
联立1、2、3解得:1<x≤√2
热心网友
时间:2024-10-29 04:38
-1≤x-1<x²-1≤1
1、-1≤x-1,得:x≥0 -----------------------------------①
2、x-1<x²-1
x²-x>0
得:x<0或x>1 -----------------------------------------------②
3、x²-1≤1
x²≤2
得:-√2≤x≤√2 --------------------------------------------③
综合①②③,有:1<x≤√2