若(6x+16x)n展开式中第二、三、四项的二项式系数成等差数列.(1)求n的值 发布时间:2017-04-29 12:51 │ 来源:www.tikuol.com 题型:解答题 问题: 若(6x+16x)n展开式中第二、三、四项的二项式系数成等差数列.(1)求n的值;(2)此展开式中是否有常数项,为什么?
题型:解答题 Great attention must be devoted ________ agriculture(农业), especially in China, ______ population is the largest in the world.A.to be developed; whoseB.to develop; whichC.to developing; whoseD.to developing; which 查看答案