9999乘9999

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9999乘99999999乘99999999乘99999999×9999=9999×(10000-1)=9999×10000-9999×1=99990000-9999=9998000199980019

9999乘9999
9999乘9999

9999乘9999
9999×9999
=9999×(10000-1)
=9999×10000-9999×1
=99990000-9999
=99980001

9998001

9999×9999=9999×(10000-1)=99990000-9999=99990000-(10000-1)=99990000-10000+1=99980001

1乘2乘2乘2222乘3333乘4444乘5555乘6666乘7777乘8888乘9999等于几? 3333乘6666乘9999乘2222的简便算法 9999乘6666乘21+3333乘55 99乘999乘9999=? 9999乘8+1111乘28=( ) 9999乘7+1111乘37等于? 9999乘7+1111乘37 简算9999乘7778+3333乘6666 9999乘 22222 3333乘33334简算 9999乘7778+3333乘6666 9999乘7778加3333乘6666 7778乘9999加3333乘6666 9999乘9999+1999 9999乘9999 9999乘999997等于 99999乘9999 9乘9999个九是几 9999乘99999998001