若a
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若a
若a
若a
1.ax+b
a> -b/a
若|4x-5|=5-4x
说明若4x-5小于0,故,x< 5/4
当5x+2大于0时,它为非负数,x>-2/5
1.x>-b/a
2.x<=1.25
1,ax<-b
because a<0
so x>-b/a
because aso -b/a<0
so x>-1
2,if 4x-5=5-4x
then x=0
if 5-4x=5-4x
then have no answer
so x=0
3,5x+2>0
5x>-2
x>-2/5