1/2(1/x+1/y)=1
x+2y=(x+2y)*1/2*(1/x+1/y)
=1/2(1+x/y+2y/x+2)
=1/2(x/y+2y/x+3)
>=1/2[2根号[x/y*2y/x]+3]
=1/2(2根号2+3)
即最小值是:(2根号2+3)/2
1/2(1/x+1/y)=1
x+2y=(x+2y)*1/2*(1/x+1/y)
=1/2(1+x/y+2y/x+2)
=1/2(x/y+2y/x+3)
>=1/2[2根号[x/y*2y/x]+3]
=1/2(2根号2+3)
即最小值是:(2根号2+3)/2