9876×9876-9875×9877怎么简算?

分类: 作业答案 • 2021-12-31 12:15:32

问题描述：

答

9876×9876-9875×9877
=9876×9876-(9876-1)×(9876+1)
=9876×9876-(9876×9876-1×1)
=9876×9876-9876×9876+1×1
=1