解:x-1/2>=0 x>=1/21/2-x>=0 x<=1/2则x=1/2y=1/2|5x+(2y-1)|--√y^2-2Y+1=|5/2|-|1/2-1|=2
解:x-1/2>=0x>=1/21/2-x>=0x<=1/2则x=1/2y=1/2|5x+(2y-1)|--√y^2-2Y+1=|5/2|-|1/2-1|=2