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

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

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

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