1999×1998-1997×1996的简便计算
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/06/30 20:33:18
1999×1998-1997×1996的简便计算
![1999×1998-1997×1996的简便计算](/uploads/image/z/2050896-48-6.jpg?t=1999%C3%971998%EF%BC%8D1997%C3%971996%E7%9A%84%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97)
1999×1998-1997×1996
=1999×1998-(1998-1)×1996
=1999×1998-1998×1996+1996
=3×1998+1996
=3×(2000-2)+1996
=6000-6+1996
=7990
=1999×1998-(1998-1)×1996
=1999×1998-1998×1996+1996
=3×1998+1996
=3×(2000-2)+1996
=6000-6+1996
=7990