9999999×9999999简便计算等待复制;(9999999+1)×9999999-9999999=999999900000000-9999999=9999998900000001

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9999999×9999999简便计算等待复制;(9999999+1)×9999999-9999999=999999900000000-9999999=99999989000000019999999×

9999999×9999999简便计算等待复制;(9999999+1)×9999999-9999999=999999900000000-9999999=9999998900000001
9999999×9999999简便计算
等待复制;(9999999+1)×9999999-9999999=999999900000000-9999999=9999998900000001

9999999×9999999简便计算等待复制;(9999999+1)×9999999-9999999=999999900000000-9999999=9999998900000001
原式=(100000000-1)x9999999
=100000000x9999999-9999999
=999999900000000-9999999
=999999890000001