题目

6.已知数列{an}满足a0=1,an=a0+a1+…+an-1(n≥1),则当n≥1时,an=(    )  A.2n                                                                                                          B.n(n+1)C.2n-1                                                                                                                        D.2n-1 答案:C
数学 试题推荐