问题
解答题
99999×99999.
答案
99999×99999,
=(100000-1)×99999,
=100000×99999-99999,
=9999900000-99999,
=9999800001.
99999×99999.
99999×99999,
=(100000-1)×99999,
=100000×99999-99999,
=9999900000-99999,
=9999800001.