已知函数y=根号下|x|-x/x-1的定义域为A,函数y=根号下x+1+1的值域为B,求A∩B
人气:282 ℃ 时间:2019-08-19 19:01:36
解答
A:因为在根号下,所以(|x|-x)≥0,分类讨论
(1)x≥0时,|x|-x等于0符合.
(2)x<0时,|x|-x=-2x>0符合.所以x∈R.
又因为x-1为分母不为0.所以x≠1.
综上A={x|x≠1}
B:{根号下(x+1)}+1的值域是吧、这样根号下(x+1)≥0.
所以B=【1,+∞)
所以A∩B=(1,+∞)
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