标题: prep一数学题 求解答 [打印本页] 作者: dididadaya 时间: 2012-1-13 15:47 标题: prep一数学题 求解答 For every integer k from 1 to 10, inclusive, the kth term of a certain sequence is given by .If T is the sum of the first 10 terms in the sequence, then T is
(A) greater than 2
(B) between 1 and 2
(C) between 1/2 and 1
(D) between 1/4 and 1/2
(E) between 1/4
作者: 站在刀尖舞蹈 时间: 2012-1-13 15:52
什么叫“the kth term of a certain sequence is given by" ? given by神马？囧作者: dididadaya 时间: 2012-1-13 17:09
given by 后面是个公式 （-1）的k+2次幂，乘以 1 ———— 2的k次幂