Sn=n[2a1+(n-1)d]÷2
335=10[2a1+9×3]÷2
335=5[2a1+27]
65=2a1+27
a1=20
更正
倒數第二式是67=2a1+27
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1-2 等差級數 主題2 三
概念© 座位問
1. 一場戶外蚊子電影院,預計要排 335 個座
位,一共 10 排,且每一排都比前一排多3
個座位,則
第一排要放多少個座位?
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