9999乘999等于几?

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9999乘999等于几?
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9999乘999等于几?
9999乘999等于几?

9999乘999等于几?
9989001

9989001
9999*999可用简便计算
=(10000-1)*999
=10000*999-1*999
=9990000-9999
=9989001

9999*999可用简便计算
=(10000-1)*999
=10000*999-1*999
=9990000-9999
=9989001

9999*999
=(10000-1)*(1000-1)
=10000000-10000-1000+1
=9989001