WebMarch 18, 2024 - 180 likes, 24 comments - قاب موبايل - پاپ سوكت (@rojedesiign) on Instagram: "• ⭕️چاپ طرح دلخواه بر ... WebJan 28, 2012 · 关注 a7+a8+a9=s9-s6 因为等差数列依次k项之和仍是等差数列 所以s3,s6-s3,s9-s6成等差数列 即9,36-9,s9-36成等差 等差d=(36-9)-9=18 s9-s6=(36-9)+18=45 所以a7+a8+a9=45 5 评论 分享 举报 王百浩度冰 2012-01-30 关注 设这个等差数列为An,则 (A1+A2+A3), (A4+A5+A6), (A7+A8+A9)仍为等差数列,即S3,S6-S3,S9 …
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等差数列S3=9,S6=36,则a7+a8+a9=? - 百度知道
WebDec 2, 2024 · You're given that a9 =-512/9. if this is a geometric sequence, the signs should be alternating, yet a5 is +, a6 - a7 + a8 - a9 should be +. something doesn't look right. ar^n with r= common ratio means r is negative to get an a9 negative, but then a5 would be negative also. It's not a geometric sequence as given. Upvote • 0 Downvote. Add comment. WebWhat Is The Formula For Calculating Arithmetic Sequence? If the initial term of an arithmetic sequence is a 1 and the common difference of successive members is d, then the nth term of the sequence is given by: a n = a 1 + (n - 1)d The sum of the first n terms S n of an arithmetic sequence is calculated by the following formula: Web7 Likes, 0 Comments - @dccom8888 on Instagram: "Update List Android Lengkap DC COM Medan 0851.0066.3999 Page 1 - Samsung dan Oppo . Samsung ..." don farnsworth