2020届高考数学（理）一轮复习精品特训专题十：计数原理（9）二项式定理C

计数原理（9）二项式定理C1、已知()201612x−=()()()()()2201520160122015201622...22Raaxaxaxaxx+−+−++−+−,则123420152016234...20152016aaaaaa−+−++−=()A.1008B.2016C.4032D.02、若()828012812...xaaxaxax−=++++,则1238...aaaa++++=()A.821−B.82C.831−D.833、二项式12nxx+的展开式前三项系数成等差数列,则n=()A.6B.7C.8D.94、若2017220170122017(12018)()xaaxaxaxxR−=+++,则2017122017201820182018aaa+++的值为()A.20172018B.1C.0D.1?−5、已知()1nx+的展开式中第4项和第8项的二项式系数相等,则奇数项的二项式系数和为()A.122B.112C.102D.926、设921101211(1)(23)(2)(2)(2)xxaaxaxax++=+++++++L,则1211aaa+++L的值为()