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①99×99=9801999×999=9980019999×9999=9998000199999×99999=;999999×99999=.②11×11=1211111×111=1232111111×1111=123432111111×11111=.

题目详情
①99×99=9801                        
 999×999=998001                         
9999×9999=99980001                     
99999×99999=______;
999999×99999=______.
②11×11=121
1111×111=12321
11111×1111=1234321
11111×11111=______.
▼优质解答
答案和解析
(1)因为99×99=9801,999×999=998001,9999×9999=99980001.
所以99999×99999=9999800001.
999999×999999=999998000001;
(2)通过找规律可知11111×1111=123454321.
故答案为:9999800001.999998000001;123454321.