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zz3476: ½ð±Ò+5, ¶Ô£¬ÓеÀÀí¡£ 2014-04-13 20:38:32
Áîu=t*x,v=t*y,
ÒòΪf(t*x,t*y)=f(u,v)=t^n*f(x,y)
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Pf(u,v)/Pu*x+Pf(u,v)/Pv*y=n*t^(n-1)*f(x,y)
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x^2*P^2f(u,v)/Pu^2+2*x*y*P^2f(u,v)/(Pu*Pv)
    +y^2*P^2f(u,v)/Pv^2=n*(n-1)*t^(n-2)*f(x,y)
                                     =n*(n-1)*t^(n-2)*f(u/t,v/t)
                                       =n*(n-1)*t^(n-2)*(1/t)^n*f(u,v)
u^2*P^2f(u,v)/Pu^2+2*u*v*P^2f(u,v)/(Pu*Pv)+
    +v^2*P^2f(u,v)/Pv^2=n*(n-1)*f(u,v)
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3Â¥2014-04-13 17:03:55
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ÒýÓûØÌû:
4Â¥: Originally posted by zz3476 at 2014-04-13 19:45:09
ÄãµÄµ¹ÊýµÚ¶þ²½ÖÐt^(n-2)*(1/t)^nºÃÏñÏû²»µô°É
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