【简答题】已知数列{a n }和{b n }的通项公式分别为a n =3n+6,b n =2n+7(n∈N*),将集合{x|x=a n ,n∈N*}∪{x|x=b n ,n∈N*}中的元素从小到大依次排列,构成数列c 1 ,c 2 ,c 3 ,…c n 。 (1)c 1 ,c 2 ,c 3 ,c n ; (2)求证:在数列{c n }中,但不在数列{b n }中的项恰为a 2 ,a 4 ,…a 2n ,…;...
【简答题】It ’ s no secret that some of the resolutions that many of us vowed to pursue in the new year — eat healthy, lose weight, quit smoking, save more money — have already fallen by the wayside. Many of th...