求f(x,y)=4x^3-4x^2+2xy-y^2在三角形闭区域0≤x≤1,0≤y≤x的极值

2024-11-06 00:29:36
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回答(1):

x^2(4x-3)+(x-y)^2=<1+1=2
x^2(4x-3)+(x-y)^2>=x^2(4x-3)=(-1/4)2x*2x*(3-4x)>=-1/4