สูตรผลบวก n พจน์แรกของลำดับเลขคณิตคือ
อนุกรมเลขคณิต

Flashcard
•
Mathematics
•
11th Grade
•
Easy
ภาพตะวัน เซ็นสุรีย์
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10 questions
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1.
FLASHCARD QUESTION
Front
Back
sn = n/2( a1+an) หรือ n/2(2a1+ d(n-1)
2.
FLASHCARD QUESTION
Front
ผลบวก1+2+3+....+n ตรงกับข้อใด
Back
n/2 (n+1)
3.
FLASHCARD QUESTION
Front
1 + 3 + 5 + 7 + ... + 99
Back
2500
4.
FLASHCARD QUESTION
Front
ผลบวก 61+63+65+...+99
Back
1,600
5.
FLASHCARD QUESTION
Front
ผลบวก 1 - 2 + 3 - 4 + ... - 100
Back
-50
6.
FLASHCARD QUESTION
Front
Find the sum of the first 10 terms of the series 2+5+8+...
Back
155
7.
FLASHCARD QUESTION
Front
Find the sum of all terms in the arithmetic series 7+10+13+...+160.
Back
4,324
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