个人理解题目为9×1/7+99×2/7+999×3/7+9999×4/7+99999×5/7+999999×6/7=?原题=(10-1)×1/7+(100-1)×2/7+(1000-1)×3/7 +(10000-1)×4/7 +(100000-1)×5/7 +(1000000)×6/7 ...
谁知道9 1/7+99 2/7+999 3/7+9999 4/7+99999 5/7+999999 6/7=
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