12345*9999怎么简便运算?

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12345*9999怎么简便运算?
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12345*9999怎么简便运算?
12345*9999怎么简便运算?

12345*9999怎么简便运算?
12345*9999
=12345*(10000-1)
=12345*10000-12345*1
=123450000-12345
=123437655
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