9+99+999+9999...+99999999
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9+99+999+9999...+999999999+99+999+9999...+999999999+99+999+9999...+999999999+99+999+9999...+99999999
9+99+999+9999...+99999999
9+99+999+9999...+99999999
9+99+999+9999...+99999999
9+99+999+9999...+99999999
=10+100+1000+10000+.+100000000-8
=111111110-8
=111111102
9+99+999+9999...+99999999
999+99+9
999+99+9=?
(-9)+(-99)+(-999)+(-9999)
999×99×9巧算,
9999+999+99+9
7×9=63 77×99=7623 777×999=776223.7777.(N个)×9999.(N个)=?
9999+999+99+9 9999+999+99+9+6 巧算
101*99*999+999
简算9+99+999+9999
999-99+9简便算法,
9+99+999+9999+...99999999
9+99+999+9999巧算
9999+999+99+9+8
(-99)×999
1,-3/2,1/3,-3/4,1/5,-3/6.的通项公式 和 9,99,999,9999.的通项公式!
用简便方法计算9+99+999+999怎么算
999*99+999 简便运算