(-1997)+1又2/3+1995+(-2又1/3)+(-1997)-(-2/3)+1(+11)+(-1/2)+(+7)+(-1/6)+(+2)+(-1/3)?(-1/2)-(-2又1/3)+2又3/4+(-7/8)-3又2/3
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![(-1997)+1又2/3+1995+(-2又1/3)+(-1997)-(-2/3)+1(+11)+(-1/2)+(+7)+(-1/6)+(+2)+(-1/3)?(-1/2)-(-2又1/3)+2又3/4+(-7/8)-3又2/3](/uploads/image/z/14596705-1-5.jpg?t=%28-1997%29%2B1%E5%8F%882%2F3%2B1995%2B%28-2%E5%8F%881%2F3%29%2B%28-1997%29-%28-2%2F3%29%2B1%EF%BC%88%2B11%EF%BC%89%2B%EF%BC%88-1%2F2%EF%BC%89%2B%EF%BC%88%2B7%EF%BC%89%2B%EF%BC%88-1%2F6%EF%BC%89%2B%EF%BC%88%2B2%EF%BC%89%2B%EF%BC%88-1%2F3%EF%BC%89%3F%28-1%2F2%29-%28-2%E5%8F%881%2F3%29%2B2%E5%8F%883%2F4%2B%28-7%2F8%29-3%E5%8F%882%2F3)
(-1997)+1又2/3+1995+(-2又1/3)+(-1997)-(-2/3)+1(+11)+(-1/2)+(+7)+(-1/6)+(+2)+(-1/3)?(-1/2)-(-2又1/3)+2又3/4+(-7/8)-3又2/3
(-1997)+1又2/3+1995+(-2又1/3)+(-1997)-(-2/3)+1
(+11)+(-1/2)+(+7)+(-1/6)+(+2)+(-1/3)?
(-1/2)-(-2又1/3)+2又3/4+(-7/8)-3又2/3
(-1997)+1又2/3+1995+(-2又1/3)+(-1997)-(-2/3)+1(+11)+(-1/2)+(+7)+(-1/6)+(+2)+(-1/3)?(-1/2)-(-2又1/3)+2又3/4+(-7/8)-3又2/3
(-1997)+1又2/3+1995+(-2又1/3)+(-1997)-(-2/3)+1
= -1997-1997+1995+1又2/3-2又1/3+2/3+1
= -1999+1
= -1998
(+11)+(-1/2)+(+7)+(-1/6)+(+2)+(-1/3)
=11-1/2+7-1/6+2-1/3
=11+7+2-3/6-1/6-2/6
=20-1
=19
(-1/2)-(-2又1/3)+2又3/4+(-7/8)-3又2/3
= -1/2+2又1/3+2又3/4-7/8-3又2/3
= -2/4+2又3/4-7/8+2又1/3-3又2/3
=11/8-4/3
=33/24-32/24
=1/24
(-1997)+1又2/3+1995+(-2又1/3)+(-1997)-(-2/3)+1
=-1997+1995-1997+1又2/3-2又1/3+2/3+1
=-1997-2+0+1
=-1998
(+11)+(-1/2)+(+7)+(-1/6)+(+2)+(-1/3)
=11+7+2-(1/2+1/6+1/3)
=20-1
=19