12.5*8又4分之3-9.5÷(1-35分之31)
=25/2*35/4-9.5÷(4/35)
=25/2*35/4-9.5*35/4
=(25/2-19/2)*35/4
=3*35/4
=105/4
(2又2005分之1*9又8分之5-7又2003分之2002*9.625)÷96又4分之1
=(2又2005分之1*9.625-7又2003分之2002*9.625)÷(385/4)
=(2+1/2005-7-2002/2003)*9.625÷(385/4)
=(-5+1/2005-1+1/2003)*9.625*(4/385)
=(-6+4008/2005*2003)*38.5/385
=-0.6+(4008/2005*2003*10)
=-0.6+0.0001
=-0.5999