计算:1999...9(n个9)*999...9(n个9)+1999...9(n个9)

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计算:1999...9(n个9)*999...9(n个9)+1999...9(n个9)
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计算:1999...9(n个9)*999...9(n个9)+1999...9(n个9)
计算:1999...9(n个9)*999...9(n个9)+1999...9(n个9)

计算:1999...9(n个9)*999...9(n个9)+1999...9(n个9)
1999...9(n个9)*999...9(n个9)+1999...9(n个9)
提出公因式1999...9(n个9)得到
1999...9(n个9)*(999...9(n个9)+1)
=1999...9(n个9)*1000...0(n个0)
=1999...9(n个9)00000...000(n个0)

=1999...9(n个9)00000...000(n个0)