9876×9876-9875×9877怎么简算?

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9876×9876-9875×9877怎么简算?9876×9876-9875×9877怎么简算?9876×9876-9875×9877怎么简算?9876×9876-9875×9877=9876×987

9876×9876-9875×9877怎么简算?
9876×9876-9875×9877怎么简算?

9876×9876-9875×9877怎么简算?
9876×9876-9875×9877
=9876×9876-(9876-1)×(9876+1)
=9876×9876-(9876×9876-1×1)
=9876×9876-9876×9876+1×1
=1

9876×9876-9875×9875-9875×2
=(9876+9875)(9876-9875)-9875×2
=
往下自己计算了哈哈

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

9876×9876-9875×9877
=98769×876-(9876-1)×(9876+1)
=9876×9876-9876×9876+1
=1

9876*9876-9875*9876-9875*1
9875*9876+1*9876-9875*9876-9875*1