那么AS内的流量近似值为 △①;≈v(Mz)n(Mz)△S (Pcosa; +Ocos Bi+ROSY] )As =P(△S)z+c(△S;)a+R(△s;)xy ①≈∑|P(△S)z+Q(△S)ax+R(AS)y 取=max{△S的直径}, 1<i<n ①=Iim∑P(△S)yz+Q(AS;)ax+R(△S)x ->0;1 K心那么Si内的流量近似值为 = P i +Q i + R i Si ( cos cos cos ) i Mi n Mi Si    ( ) ( )    P Si yz Q Si zx R Si x y = ( ) + ( ) + ( ) [ ( ) ( ) ( ) ] 1 i yz i zx i x y n i    P S + Q S + R S = max{ }, 1 取 i的直径 i n = S    lim [ ( ) ( ) ( ) ]. 1 0 i yz i zx i x y n i  =  P S + Q S + R S → = 