The pages of a report are numbered consecutively from 1 to 10. If the sum of the page numbers up to and including page number x of the report is equal to one more than the sum of the page numbers following page number x, then x= A 4 B 5 C 6 D 7 E 8 答案选D。我没读懂题。。。。
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发表于 2011-9-10 14:57:51
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