若f(n)=1+12+13+…+12n+1(n∈N*),则当n=1时,f(n)为 发布时间:2017-04-22 21:32 │ 来源:www.tikuol.com 题型:选择题 问题: 若f(n)=1+12+13+…+12n+1(n∈N*),则当n=1时,f(n)为( )A.1B.13C.1+12+13D.非以上答案
题型:选择题 The police found that the house _____ and a lot of things _____.A. has been broken into, has been stolen B. had broken in, had been stolenC. had been broken into, stolen D. has been broken into, stolen 查看答案