有理数的巧算 999*998998999-998*999999998
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发布时间:2024-10-13 13:21
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时间:2024-10-15 03:26
999*998998999-998*999999998
=999*998998000+999*999-998*999999000-998*998
=999*998*1001000+999*999-998*999*1001000-998*998
=999*999-998*998
=(999-998)*(999+998)
=1997