99999999*99999999=

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99999999*99999999=

99999999*99999999=
99999999*99999999=

99999999*99999999=
授人以渔不如教人以鱼,解这样的题关键还是要有思路,不能向上面的人只给答案,将来你还是会遇到问题.思路如下:
99999999*99999999=99999999*(100000000-1)
=9999999900000000-99999999
=9999999900000000-100000000+1
=9999999800000000+1
=9999999800000001
请尊重彼此,及时采纳答案!

9999999800000001

9 999 999 800 000 000
答题不易,望采纳,祝学习进步

99999999*99999999=100000000x99999999-99999999=9999999900000000-99999999=9999999800000001