1.本单元重、难点分析1)理解等差、等比数列的概念,掌握等差、等比数列的通项公式与前n项和公式,掌握等差数列,等比数列的有关性质及在公式推导过程中所涉及的数学思想方法(如“归纳猜想”、“倒序相加”等).2)等差数列中,有五个基本量:a1,n,d,an,Sn,等比数列中,也有五个基本量 1. The unit’s heavy and difficult analysis 1) Understand the concepts of arithmetic and geometric progressions, master the general formulae of arithmetic progressions, geometric progressions, and the first n terms and formulas, and grasp the properties of geometric sequences and geometric progressions. The mathematical thinking methods involved in formula derivation (such as “generalization conjecture”, “reverse order addition”, etc.). 2) In arithmetic series, there are five basic quantities: a1, n, d, an, Sn, etc. There are also five basic quantities in the series