作业帮巧算需详细的过程.
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/13 17:53:57
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巧算需详细的过程.
巧算需详细的过程.
巧算需详细的过程.
9999x9999+19999
=(10000-1)x(10000-1)+20000-1
=(10000-1)^2+20000-1
=10000^2-20000+1+20000-1
=10000^2
=100000000
若仍有疑问,欢迎追问!
9999×9999+19999
=9999×9999+10000+9999
=9999×(9999+1)+10000
=9999×10000+10000
=(9999+1)×10000
=10000×10000
=100000000
10000x10000+20000-1-1x1=100020000-2
