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2x^2+2y^2+z^2+8xz-z+8=0 對x求偏導數,令z'x=0.得到x=-2z. 對x求偏導數,令z'y=0.得到y=0 代入原式.得到7z²;+z-8=0 z1=1(極大值),z2=-8/7(極小值)
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