若x+y-1=0(x>0,y>0),则(y+1)/(x+1)的取值范围是

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若x+y-1=0(x>0,y>0),则(y+1)/(x+1)的取值范围是
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若x+y-1=0(x>0,y>0),则(y+1)/(x+1)的取值范围是
若x+y-1=0(x>0,y>0),则(y+1)/(x+1)的取值范围是

若x+y-1=0(x>0,y>0),则(y+1)/(x+1)的取值范围是
显然,0