999...9(1992个9）*99...9(1992个9）+199...9(1992个9）的末尾有多少个零

分类: 作业答案 • 2022-04-16 00:06:39

问题描述：

答

999……9(1992个9)*99……9(1992个9)+199...9(1992个9)
=999……9(1992个9)*(99……9(1992个9)+1)
=999……9(1992个9)*10……0(1992个0)
末尾有1992个零