
20250310等差級數小測驗
Authored by Yao Jamie
Mathematics
8th Grade

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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
等差級數的首項記作哪個符號?
d
Sn
a1
n
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
等差級數的公差 d指的是?
每一項與首項的差
相鄰兩項的差
首項與末項的差
項數的總和
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
等差級數的通項公式為何?
an=a1+(n−1)d
an=a1+nd
an=a1d^n
an=a1+n(n−1)d
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
等差級數的總和公式為何?
Sn=n2(a1+an)
Sn=n2[2a1+(n−1)d]
以上皆是
以上皆非
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
若等差數列的前 n 項總和為 Sn,則當 n 增加時,總和會如何變化?
一定增加
一定減少
可能增加或減少
無法確定
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
已知某等差數列的首項 a1=3,公差 d=2,求第 5 項 a5。
9
11
13
15
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
若某等差數列的首項為 5,公差為 -3,則第 6 項是多少?
-7
-10
-13
-15
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