ææ¬å½æ°C(x,y)=30000+300x+200y+3x²+xy+3y²,
å©æ¶¦å½æ°F(x,y)=900xï¼1000yï¼C(x,y)
=600x+800yï¼3x²ï¼xyï¼3y²ï¼30000,
xï¼yâR+ï¼
δf/δx=δf/δyï¼0,
600ï¼6xï¼yï¼800ï¼xï¼6y=0,
xï¼y=200,yï¼x=40,
x=80,y=120ã
Fmax=48000+96000ï¼3Ã6400ï¼9600ï¼3Ã14400ï¼30000ï¼42000ã
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