第四讲 数列（二）一 【考点提示】1.数列：_________________________________________________________________2.等差数列：（1）概念：_____________________________________________________________（2）通项：_____________________________________________________________（3）等差中项：_________________________________________________________（4）等差数列前 n 项和：_________________________________________________3.等比数列：（1）概念：_____________________________________________________________（2）通项：_____________________________________________________________（3）等差中项：_________________________________________________________（4）等差数列前 n 项和：_________________________________________________4.等差数列的性质：（1）___________________________________________________________________（2）___________________________________________________________________（3）___________________________________________________________________（4）___________________________________________________________________5.等比数列的性质：（1）___________________________________________________________________（2）___________________________________________________________________（3）___________________________________________________________________6.数列通项公式的求法：（1）___________________________________________________________________（2）___________________________________________________________________（3）___________________________________________________________________（4）___________________________________________________________________（5）___________________________________________________________________（6）___________________________________________________________________（7）___________________________________________________________________（8）___________________________________________________________________（9）___________________________________________________________________（10）___________________________________________________________________...
