第24页

信息发布者:
99920007
999992000007
15
21
11
111
1111
1234
5
11111
8
11111111
8712
887112
88871112
8888711112
​$\underbrace {88···87}_{2023个8}\underbrace {111···12}_{2023个1}$​
9
99
999
9999
9999800001
99999
999999
999999
9
0
9999
9999800001
99999
999999
999999
9
找规律:
​$7×9=63,$​
​$77×99=7623,$​
​$777×999=776223……$​
总结规律,
​$\underbrace {777···7}_{2024个7}×\underbrace {999···9}_{2024个9}=\underbrace {777···7}_{2023个7}6\underbrace {222···2}_{2023个2}3。$​