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極值問題

xk=kyk 
nk=1kyk2+21kjnkykyj=1
y1+y2++yn=a1y2++yn=a2yn=an
a21+a22++a2n=1
an+1=0

ni=1xi 
=nk=1xk 
=nk=1kyk 
=nk=1k(akak+1) 
=nk=1kaknk=1kak+1 
=nk=1kaknk=1k1ak 
=nk=1(kk1)ak 
nk=1(kk1)2nk=1a2k
=nk=1(kk1)2

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