配套习题-数列通项公式的求法（一） -【青果学院】

本课配套习题挑战模式1/3

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单选题

难度系数：

1.数列-3，1，5，9，…的一个通项公式为（　　）

A: 4n-7

B: 1-4n

C: n²-4n

D: n-4

提示1：IOaVsOWIly0z77yMMe+8jDXvvIw577yM4oCm5piv6aaW6aG55Li6LTPvvIzlhazlt67kuLo055qE562J5beu5pWw5YiX
答案：QQ==
6Kej77ya5pWw5YiXLTPvvIwx77yMNe+8jDnvvIzigKbmmK/pppbpobnkuLotM++8jOWFrOW3ruS4ujTnmoTnrYnlt67mlbDliJc8YnI+4oi0YTxzdWI+bjwvc3ViPj00bi03PGJyPuaVhemAiUEuIA==

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单选题

难度系数：

2.数列7，77，777，7777…的一个通项公式是a_n=()

A:

B:

C:

D:

提示1：IOagueaNruaJgOe7meeahOi/meS4quaVsOWIl+eahOeJueeCue+8jOWFiOWGmeWHujnvvIw5Oe+8jDk5Oe+8jDk5OTnnmoTpgJrpobnmmK8xMDxzdXA+bjwvc3VwPi0x77yM5YaN5LmY5Lul5Lmd5YiG5LmL5LiD5Y2z5Y+v5b6XLg==
答案：Qg==
6Kej77ya5YWI5YaZ5Ye6Oe+8jDk577yMOTk577yMOTk5OeeahOmAmumhueaYrzEwPHN1cD5uPC9zdXA+LTHvvIw8YnI+4oi05pWw5YiXN++8jDc377yMNzc377yMNzc3N+KApueahOS4gOS4qumAmumhueWFrOW8jzxpbWcgd2lkdGg9NjggaGVpZ2h0PTQ1IHNyYz0iaHR0cHM6Ly9wMS5xaW5nZ3VvLmNvbS9HMS9NMDAvRkUvQTMvckJBQ0UxTlF4aml5S2k3REFBQUNzWldndVlBNDg5LnBuZyI+PGJyPuaVheetlOahiOS4uu+8mkI=

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单选题

难度系数：

3.无穷数列1，3，6，10…的通项公式为（　　）

A: a_n=n²-n+1

B: a_n=n²+n-1

C:

D:

提示1：6YCa6L+H6KeC5a+f5YiG5p6Q5Y+v5b6XYTxzdWI+bjwvc3ViPj1hPHN1Yj4xPC9zdWI+K++8iGE8c3ViPjI8L3N1Yj4tYTxzdWI+MTwvc3ViPu+8iSvvvIhhPHN1Yj4zPC9zdWI+LWE8c3ViPjI8L3N1Yj7vvIkr4oCmK++8iGE8c3ViPm48L3N1Yj4tYTxzdWI+bi0xPC9zdWI+77yJPTErMiszK+KApitu
答案：Qw==
6Kej77ya4oi1YTxzdWI+Mjwvc3ViPi1hPHN1Yj4xPC9zdWI+PTMtMT0y77yMPGJyPmE8c3ViPjM8L3N1Yj4tYTxzdWI+Mjwvc3ViPj02LTM9M++8jDxicj5hPHN1Yj40PC9zdWI+LWE8c3ViPjM8L3N1Yj49MTAtNj0077yMPGJyPuKApjxicj7iiLRhPHN1Yj5uPC9zdWI+PWE8c3ViPjE8L3N1Yj4r77yIYTxzdWI+Mjwvc3ViPi1hPHN1Yj4xPC9zdWI+77yJK++8iGE8c3ViPjM8L3N1Yj4tYTxzdWI+Mjwvc3ViPu+8iSvigKYr77yIYTxzdWI+bjwvc3ViPi1hPHN1Yj5uLTE8L3N1Yj7vvIk8YnI+PTErMiszK+KApituPTxpbWcgd2lkdGg9MTA5IGhlaWdodD00NSBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwL0ZFL0EzL3JCQUNFMU5ReGk3dzg4bEVBQUFESDJ0QjBqQTU5Mi5wbmciPi4gPGJyPuaVhemAiUMuIA==