2019-10-29 · 知道合伙人教育行家
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|(x-1)/(x+1)|<=1
-1<=(x-1)/(x+1)<=1
(x-1)/(x+1)<=1,(x-1)/(x+1)-1<=0,-2/(x+1)<=0,x+1>0,x>-1
(x-1)/(x+1)>=-1,(x-1)/(x+1)+1>=0,2x/(x+1)>=0,x*(x+1)>=0,x<-1 or x>=0
所以 x>=0
-1<=(x-1)/(x+1)<=1
(x-1)/(x+1)<=1,(x-1)/(x+1)-1<=0,-2/(x+1)<=0,x+1>0,x>-1
(x-1)/(x+1)>=-1,(x-1)/(x+1)+1>=0,2x/(x+1)>=0,x*(x+1)>=0,x<-1 or x>=0
所以 x>=0
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