GIF89a - ! , - ڋOVLo3{ĢqǦ
Ie
Q+6{EQtd1>C6V6v8"6Xg(hIACGEǧ
wڲ
[9`ʋ(X$fعgʐ
z*b̭(u4]
:lFF-맋 ]Õ0[C0 1hQU=c$MG{>i4]̳D#noFc"EϐO3,CCyLNms@fǓzFֱG̣oR,$8}g,H;GRwBjnW53ޓ-B#E/;{.JyOV5i|Ǒɠz;tݯ4sc8
i'V̆_|Ub^wtؽi9k]clek%%
S
(V9`d`ҌFŌq^aY !MathType001
N k () k=0 N d
p U k
1-
p U
() N-k
= a/2 ;