請問這題數學怎麼寫??等差級數.求過程?
回答 (1)
2019-03-03 9:07 am
Sol
(52－1)/3=17
(100－1)/3=33
a(1)=1
d=3
a(34)=a(1)+33d=100
a(18)=a(1)+17d=52
34－18+1=17
S=(52+100)*17/2=1292
(52－1)/3=17
(100－1)/3=33
a(1)=1
d=3
a(34)=a(1)+33d=100
a(18)=a(1)+17d=52
34－18+1=17
S=(52+100)*17/2=1292
收錄日期: 2021-04-30 22:56:13
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20190302164821AAvJSLU