①99×99=9801
999×999=998001
9999×9999=99980001
99999×99999=______;
999999×99999=______.
②11×11=121
1111×111=12321
11111×1111=1234321
11111×11111=______.
(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.