題目 Problem Let S={(x,y):0≤x≤y≤1}.S=\{(x,y):0\le x\le y\le 1\}.S={(x,y):0≤x≤y≤1}. Find the maximum of f(x,y)=x2−7y24+xy−ln(1+x)f(x,y)=x^2-\frac{7y^2}{4}+xy-\ln(1+x)f(x,y)=x2−47y2+xy−ln(1+x) on SSS. 解答 待補。
