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x+y+z=16,l=xyz,那麼l=xy(16-x-y)=16xy-xxy-xyy;將l對x,y分別求偏導數,使他們為零.則得16y-2xy-yy=0;16x-2xy-xx=0;即16-2x-y=0;16-2y-x=0;顯然x=y=16/3;又由於x,y是整數,所以要取…
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