2008分之2007除以2009分之一
=2007/2008*2009
=2007/2008*(2008+1)
=2007+1/2008
=2007又1/2008这道题呢53.5*35.3+53.5*43.2+78.5*46.5=53.5*（35.3+43.5）+78.5*46.5=53.5*78.5+78.5*46.5=（53.5+46.5）*78.5=100*78.5=7850