题目

在数列{an}中，an－an+1=10,a1=2,则a6等于 A.－8                                                              B.18C.38                                                              D.－48 答案：解析:an+1=an－10,∴a2=－8,a3=－18,a4=－28,a5=－38,a6=－48.答案:D

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