9876×9876-9875×9877怎么简算?_数学解答

9876×9876-9875×9877怎么简算?

人气：345 ℃　时间：2020-06-15 10:29:13

解答

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