-3/8-(+1/4)-(-1/2)-12/9-1又5/8+(-2又1/4)-(8又12/19)等于

问题描述:

-3/8-(+1/4)-(-1/2)-12/9-1又5/8+(-2又1/4)-(8又12/19)等于

原式=-3/8-1/4+1/2-12/9-13/8-9/4-164/19
=-3/8-13/8-1/4-9/4+1/2-12/9-164/19
=-16/8-10/4+1/2-4/3-164/19
=-16/8-20/8+4/8-4/3-164/19
=-32/8-4/3-164/19
=-4-76/57-492/57
=-4-568/57-2/57+2/57
=-14+2/57
答:原题等于-13又55/57。

-3/8-(+1/4)-(-1/2)-12/19-1又5/8+(-2又1/4)-(-8又12/19)
=(-3/8-1又5/8)+(-1/4-2又1/4+1/2)+(-12/19+8又12/19)
=-2-2+8
=4