33333+66666 每个数位上相加都是9 所以=99999
1997*19980000+1997*1998-1998-19970000-1997
=1996*1998*10001+10001-1998
=19961995*1998+10001
=39884076011
(7/4-7/8-7/12)*(-8/7)
=-2+1+2/3
=-1/3
33333+66666 每个数位上相加都是9 所以=99999
1997*19980000+1997*1998-1998-19970000-1997
=1996*1998*10001+10001-1998
=19961995*1998+10001
=39884076011
(7/4-7/8-7/12)*(-8/7)
=-2+1+2/3
=-1/3