x=5^1/2-0.5,y=5^1/2+0.5,x/y+y/x+2=(x^2+y^2)/(xy)+2=[(5^1/2-0.5)^2+(5^1/2+0.5,)^2]/[(5^1/2-0.5)(5^1/2+0.5,)]+2=10.5/4.75+2=42/19+38/19=80/19
等于十九分之八十，过程不好打
