得0!
you cn get a reguar rule from fx=f[x-1]-f[x-2]
f2009=f2008-f2007;
f2008=f2007-f2006;
f2006=f2005-f2004;
.
f2009=f[-2006]=f2004=f-2002=.=f0=log2[1]=0
得0!
you cn get a reguar rule from fx=f[x-1]-f[x-2]
f2009=f2008-f2007;
f2008=f2007-f2006;
f2006=f2005-f2004;
.
f2009=f[-2006]=f2004=f-2002=.=f0=log2[1]=0