已知(x2-ix)n的展开式中第三项与第五项的系数之比为-314,其中i2=-1 发布时间:2017-05-16 18:36 │ 来源:www.tikuol.com 题型:选择题 问题: 已知(x2-ix)n的展开式中第三项与第五项的系数之比为-314,其中i2=-1,则展开式中常数项是( )A.-45iB.45iC.-45D.45
题型:选择题 Yesterday he told me that he had met his uncle _____.A. two years ago B. two years before C. before two years D. for two years 查看答案