999...9×999...9+1999...9的末尾有多少个0...是1997个9

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999...9×999...9+1999...9的末尾有多少个0...是1997个9

999...9×999...9+1999...9的末尾有多少个0...是1997个9
999...9×999...9+1999...9的末尾有多少个0
...是1997个9

999...9×999...9+1999...9的末尾有多少个0...是1997个9
999...(1997个9)9×999...(1997个9)9+1999...(1997个9)9
=999...(1997个9)9×[999...(1997个9)9+1]
=999...(1997个9)9×[100...(1997个0)0]
因此,末尾有1997个0