
等差級數
Quiz
•
Mathematics
•
8th - 9th Grade
•
Practice Problem
•
Hard
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21 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
1+2+3+4+5+........+100=?
1010
2020
3030
4040
5050
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
設一等差級數的第 3 項是 5,第 9 項是 8,和為 2821.5,則此級數共有幾項?
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
等差級數前 10 項和 S10=50,若將各項加 5,則總和為多少?
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
一等差級數前 49 項的和為 490,則第 25 項為何?
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
等差級數 S=a1+a2+……+a100,則以下何者正確?
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
有一等差級數之第 n 項為 an,若 a1+a3+a5+a7+a9=240,a2+a4+a6+a8+a10=220,請問 a1 為下列何值?
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
若一等差級數的首項是 7,公差是 3,則此級數第 10 項至第 30 項的和為多少?
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