9876,9876*77-9877*76

方法一:

9876*77-9877*76

=9876*(76+1)-(9876+1)*76

=(9876*76+9876)-(9876*76+76)

=9876-76

=9800

方法二:

9876*77-9877*76

=9876*77-(9876+1)*76

=9876*77-9876*76-76

=9876*(77-76)-76

=9876-76

=9800

9876*77-9877*76

=(9876*76+9876)-(9876*76+76)

=9870

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