1997×199819981998-199719971997×1998

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/28 11:26:14
1997×199819981998-199719971997×1998

1997×199819981998-199719971997×1998
1997×199819981998-199719971997×1998

1997×199819981998-199719971997×1998
1997×199819981998-199719971997×1998
=1997*(199719971997+100010001)-199719971997*(1997+1)
=1997*199719971997+1997*100010001-1997*199719971997-199719971997
=199719971997-199719971997
=0

额……
1997×(199819981998-199719971997)-199719971997
=100010001×1997-199719971997
=199719971997-199719971997
=0

原式=1997*1998*111-1997*111*1998
=0

=1997*1998(100010001-100010001)=0