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此题答案的精度到底是怎么回事？？？？？？！！！！！！

Posted by ian at 2004-06-23 23:42:01 on Problem 1671 
我的答案：

20 51724158235372
30 846749014511809332450147
40 157450588391204931289324344702531067
50 185724268771078270438257767181908917499221852770

正确答案：

20 51724158235372
30 846749014511809250000000
40 157450588391204940000000000000000000
50 185724268771078310000000000000000000000000000000

答案只保留了前17位，而且最后的几位不够准确！？
谁能给个合理的解释？？？
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