y=√(x-1/2)+√(1/2-x)+1/2x-1/2≥0,x≥1/21/2-x≥0,1/2≥x所以,x=1/2y=0+0+1/2=1/25x+|2y-1|-√(y^-2y+1)=5/2+(2*1/2-1|+√(1/4-1+1)=5/2+0+1/2=3