1）目标函数f(x,y)=(x-1)^2+(y-2)^2 .
2) 约束条件y-x^2=0.
3) Lagarange函数Φ(x,y,λ)=(x-1)^2+(y-2)^2+λ(y-x^2).
4）最小点满足的方程组2(x-1)-2λx=0.(1)
2(y-2)+λ=0.(2)
y-x^2=0.(3)