題目 Problem IV. (15%)(15\%)(15%) Find all absolutely extreme values of the function f(x,y)=x2+3y2+yf(x,y)=x^2+3y^2+yf(x,y)=x2+3y2+y subject to the constraint x2+y2≤1。x^2+y^2\le 1。x2+y2≤1。 解答
