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设f(x,y)在[a,b]×[c,d]上连续,,证明: gxy=gyx(x,y)=f(x,y) (a<x<b,c<y<d).
设f(x,y)在[a,b]×[c,d]上连续,
,证明: gxy=gyx(x,y)=f(x,y) (a<x<b,c<y<d).
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设f(x,y)在[a,b]×[c,d]上连续,
,证明: gxy=gyx(x,y)=f(x,y) (a<x<b,c<y<d).
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