解不等式Ix+1I+Ix-1I

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解不等式Ix+1I+Ix-1I解不等式Ix+1I+Ix-1I解不等式Ix+1I+Ix-1I|x+1|+|x-1|=|x+1|+|1-x|>=|x+1+1-x|=2所以|x+1|+|x-1|不成立X=+

解不等式Ix+1I+Ix-1I
解不等式Ix+1I+Ix-1I

解不等式Ix+1I+Ix-1I
|x+1|+|x-1|
=|x+1|+|1-x|>=|x+1+1-x|=2
所以|x+1|+|x-1|

不成立

X=+1或-1