9999乘99999998001

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9999乘99999998001
9999乘9999
9998001

9999乘99999998001
9999×9999
=9999×(10000-1)
=99990000-9999
=99980001

自问自答很爽吧

9998001

9998001

9999乘9999
=9999×(1000-1)
=99991000-9999
=9998001
祝你开心!