
八年級數學-等差級數
Quiz
•
Mathematics
•
8th - 9th Grade
•
Practice Problem
•
Hard
蔡佩旻 蔡佩旻
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20 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
計算 2+3+……+67 之和為多少?
2277
2266
3388
2535
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
等差級數的第 n 項為 an=-3n+23,前 n 項的和為 Sn,則 Sn的最大值為下列何者?
55
66
77
88
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
若有一等差級數共 10 項,其第 3 項是 5,第 5 項是 3,則此級數和為多少?
20
25
30
35
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
等差級數 S=38+35+32+……,加到第幾項時,S 有最大值?
12
13
14
15
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
某個趣味競賽是在一直線上放置了 10 個蘋果,每個蘋果之間的距離都是 1 公尺,每個參賽者皆需把這些蘋果全部放回第一顆蘋果的地方(參賽者皆站在第一顆蘋果的地方),且一次只能拿一顆,請問參賽者在這個遊戲中共須跑多少公尺?
70 公尺
80 公尺
90 公尺
100 公尺
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
求 1+3+5+7+9+……+91=?
1940
2027
2116
2209
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
若一等差級數前 49 項的和為 490,則第 25 項為何?
5
10
15
20
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