
เรื่องอนุกรมคณิตศาสตร์
Quiz
•
Mathematics
•
Professional Development
•
Hard
Toondang lungtoon
Used 3+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
อนุกรมเลขคณิตหมายถึงอะไร
การนำลำดับเลขคณิตมาบวกกัน
การนำลำดับเลขคณิตมาลบกัน
การนำลำดับเลขคณิตมาคูณกัน
การนำลำดับเลขคณิตมาหารกัน
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
สูตรผลบวก n พจน์แรกของลำดับเลขคณิตคือ
sn = n/2( a1+an) หรือ n/2(2a1+ d(n-1))
Sn = a1(1-rn)/(1-r)
sn = a1+ d(n-1)
Sn = a1rn-1
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
ผลบวก1+2+3+....+n ตรงกับข้อใด
n/2 (n+1)
n(n+1)
n/2(n-1)
n(n-1)
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
ผลบวก 1+3+5+7+......99 ตรงกับข้อใด
2500
2050
2005
2505
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
ผลบวก 2+4+6+...+100 ตรงกับข้อใด
2550
2500
2505
2555
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
ผลบวก 10 พจน์แรกของอนุกรม 2+5+8+.... เท่ากับข้อใด
155
150
160
165
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
อนุกรมเลขคณิต ถ้า s3 = 24 และ s6 = 54 แล้ว s9 เท่ากับเท่าใด
90
180
120
45
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