19999+9999×9999简便算法.

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19999+9999×9999简便算法.

19999+9999×9999简便算法.
19999+9999×9999简便算法.

19999+9999×9999简便算法.
19999+9999×9999
=10000+9999+9999×9999
=10000+9999×(9999+1)
=10000+9999×10000
=10000×(9999+1)
=10000×10000
=100000000

19999+9999×9999
=10000×10000
=100000000

19999+9999×9999
=10000+9999+9999×9999
=10000+9999×(1+9999)
=10000+9999×10000
=10000×(1+9999)
=10000×10000
=100000000

10000+9999(1+9999)=10000+9999x10000=10000(1+9999)=100000000

=10000+9999+9999X9999
=10000+9999X(9999+1)
=10000+9999X10000
=10000X(9999+1)
=100000000

19999+9999×9999
=10000+9999+9999x9999
=10000+9999x(9999+1)
=10000+99990000
=100000000

19999+9999×9999=
10000+9999+9999×9999=
10000+9999×(9999+1)=
10000+9999×10000=
10000×(9999+1)=
100000000

19999+9999×9999
=10000+9999+9999×9999
=10000+9999×(1+9999)
=10000+9999×10000
=10000×(1+9999)
=10000×10000
=100000000
可以这样做