9876x9876-9875x9877怎么简算

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9876x9876-9875x9877怎么简算9876x9876-9875x9877怎么简算9876x9876-9875x9877怎么简算=9876²-(9876-1)×(9876+1)=9

9876x9876-9875x9877怎么简算
9876x9876-9875x9877怎么简算

9876x9876-9875x9877怎么简算
=9876²-(9876-1)×(9876+1)
=9876²-(9876²-1²)
=9876²-9876²+1
=1

=9876*9876-9875*(9876+1)
=9876*9876-9875*9876-9875*1
=9876*(9876-9875)-9875
=9876*1-9875
=1

9876x9876-9875x9877
=9876x9876-(9876-1)x(9876+1)
=9876x9876-9876x9876+1
=1

9876x9876-(9876-1)x(9876+1)=9876x9876-9876x9876+1=1

=1
9876x9876-9875x9877=9876x9876-(9876-1)x(9876+1)=9876x9876-(9876x9876-1)=1

9876x9876-(9876-1)(9876+1)
=9876x9876-9876x9876+1
=1