(-4又1/3)-(+3又1/3)-(6又1/2)+(-2又1/4)
=-4又1/3-3又1/3-6又1/2-2又1/4
=-7又2/3-8又3/4
=-15-(2/3+3/4)
=-15-17/12
=-16又5/12
=(-4-3-6-2)+(-1/3-1/3-1/2-1/4)
=-15-(4+4+6+3)/12
=-15-17/12
=-16又5/12
=-(4又1/3+3又1/3)-(6又1/2+2又1/4)
=-7又2/3-8又3/4
=-16又5/12
(-4又1/3)-(+3又1/3)-(6又1/2)+(-2又1/4)=-15.25
等于—187/12
-197/12