设[tex=2.857x1.357]oni5YFYZg9r1D8AXbqLQGA==[/tex]在平面有界闭区域[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]上具有连续的二阶偏导数，且满足[tex=4.214x2.714]Hvc3DRViYQYrFC7OWnSXUx/KmzK/fvn3ahKFrBFpVwzUTtyDtqkK3dfzr4h3JG1V8x8LvgKCg/EPBk9HA8EbhA==[/tex]及[tex=6.143x2.714]Hvc3DRViYQYrFC7OWnSXUx/KmzK/fvn3ahKFrBFpVwxvvMDwtBjq2btZle+UW18Buhrn5mk7fxtcCU9U2d4rQFg/Rmzp7N0mS8vm5DGOJno=[/tex]，则[tex=2.857x1.357]fs81OYo2b1zExBdfT8crHg==[/tex]的(A).最大值点和最小值点必定都在[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]的内部;(B).最大值点和最小值点必定都在[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]的边界上;(C).最大值点在[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]的内部，最小值点在[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]的边界上;(D).最小值点在[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]的内部，最大值点在[tex=0.857x1.0]m2DKAQtGuc1DyN3zyNlILg==[/tex]的边界上.