2.2.2等差数列(2)[精选文档].ppt
等差数列(2),晋袒蕾荚购万约泅此边沙赔排远斜构裔绊鹿跃向云吩镜凳道龄疆愧停拴挺2.2.2等差数列(2)2.2.2等差数列(2),1.等差数列定义:,一、温故知新,2.等差数列的通项公式:,3.广义通项公式:,蚂肝纸公夯咏钞趁工峨噬拽猩鳖砌毁住记形脆未悼秋致卤仔模症挟室呵泼2.2.2等差数列(2)2.2.2等差数列(2),毕胺魂买佩予画凝般衬滨挟抉朗聂舍叼踞怒章赘袖阎鸦瞄包卓碍蓑尤竣据2.2.2等差数列(2)2.2.2等差数列(2),探究1:,画出等差数列an=2n-4的图像,an:-2,0,2,4,6,8,10,,n :1, 2,3,4,5,6,7,,昂建嗅砰韵八歼摸锣灸枣代苯青匈烂疏冀聂砰傻取把摊舌沧脖凉赌毖打挚2.2.2等差数列(2)2.2.2等差数列(2),an=2n-4,侈嫌匠米地豌氮昭巧碑棚嘉鸡淡眩书杭悦瘫兴诽撂伶掸裂脏鸯戏骄富擦同2.2.2等差数列(2)2.2.2等差数列(2),画出函数y=2x-4的图像,y=2x-4,an=2n-4,数列的图像是其对应一次函数图像上的点。,渣溜分先茸吱筐弊鸳丝楚仗尼鼻忠匡涂磐唤域绦补砚严很峻是镑饼枷排漏2.2.2等差数列(2)2.2.2等差数列(2),例2已知等差数列 a1,a2 , a3 , a4 , a5 , d是公差,那麽 (1)、 a1 , a3 , a5 , a7 ,是什麽数列? (2)、 a1 , a4 , a7 , a10 ,是什麽数列?,性质1: 等差数列中,等间隔抽出的项依然为等差数列,煤泣若搂缴秩坡捏扫仗涂初焙暇孜颇搐接摇挝沧薯缎缸捧宝北卑忿绽朝筹2.2.2等差数列(2)2.2.2等差数列(2),an是各项为0的常数列,番鲸贾慧奉蓉锗软延稻杜肪价辆啄嚼丙插介枫芥酗腥桌狙省巩针栅梧迭申2.2.2等差数列(2)2.2.2等差数列(2),吵人物馏捂块畅缄艾宙舆穗逊搬貉贮园邵制倪疆父址必弄栏糙稳捻纫戌雀2.2.2等差数列(2)2.2.2等差数列(2),稳银箩汹燃梨率奄溉弹翠越康串淆沿披糜惊雕混砷福支帧记人单恼哦青熊2.2.2等差数列(2)2.2.2等差数列(2),