X dlnp+X,dlnp=0 山R=, r+,欧=0 X2=1-X1 dX-dX OLnP OLnP2 OLnX)T.P 17 X1 dLnP1 + X2 dLnP2 = 0 T P B B B B dX X LnP dLnP , ( )   = ( ) ( ) , 2 0 2 2 , 1 2 1 1 1 =   +   dX X LnP dX X X LnP X T P T P X2 =1-X1 dX2 =-dX1 T P T P X LnP X X LnP X 2 , 2 2 1 , 1 1           =           T P T P LnX LnP LnX LnP 2 , 2 1 , 1           =          