若a<0,-1<b<0,到哪里找那么好的人

已知A={x/0
sbqhxie177
A={x|1<|x-2|<2}={x|1<x-2<2,或-2<x-2<-1}={x|3<x<4,或0<x<1}B={x|x²-(a+1)x+a<0}={x|(x-1)(x-a)<0}A∩B≠∅当a>1时,B={x|1<x<a}2那么a>3;当a=1时,B=∅,不合题意,舍去;当a<1时,B={x|a<x<1},那么a<0综上,a<0,或a>3
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疯狂安宝3N丌腕
若a=1,c=0.且|f(x)|≤1即|x^2+bx|<=1-1<=x^2+bx<=1-1-x^2<=bx<=1-x^2由于x>0,二边同除以x得:-1/x-x<=b<=1/x-x(1)g(x)1=x+1/x在(0,1]上是递减函数,故g(x)1>=2.(x=1时2取"=")故-(x+1/x)<=-2(2)g(x)2=1/x-x在(040621]上是减函数,则g(x)2>=0.(x=1时,取"=")所以,b的取值范围是:-2<=b<=0
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