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第四冊 1-1 等差數列-3
等差數列的第 n 項
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1. 若一等差數列的首項為35，末項為－145，公差為－4，則此等差數列共有多少項？
20 points
44
45
46
47
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2. 若一等差數列的第5項為32，第11項為14，則其首項為何？
20 points
43
44
45
54
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3.
20 points
5n＋1
5n＋2
5n＋3
5n＋4
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4. 若一等差數列的前四項是a1，a1＋d，a1＋2d、a1＋3d，則此數列的第18項為多少？(以a1、d表示)
20 points
a1＋17d
a1＋18d
a1＋19d
a1＋20d
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5. 一等差數列－35 , －31 , －27 ,…… , 5，則此數列共有幾項？
20 points
9
10
11
12
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