題目 Problem (K) Find the critical points of f(x,y)=x2+y4+3xy2−5xf(x,y)=x^2+y^4+3xy^2-5xf(x,y)=x2+y4+3xy2−5x which are saddle points. Answer: (12)‾\underline{\quad(12)\quad}(12). 解答
