2-4 21.05.24(월) 5교시 수열 3차시 by 교생박신형 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x en-us 2021-05-20 04:39:48 UTC 2024-07-15 21:29:37 UTC hello@padlet.com https://padlet.net/icons/png/1f6f4.png 설문지를 작성해주세요! shinhyeongpark https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1542408116 2021-05-20 04:39:48 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1542408116 2405 염태인 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552681685 Sn= n{2a+(n-1)d}/2
a=10, n=100, d=2 이므로
Sn= 100{20+99x2)/2
50x 218=10900]]> 2021-05-24 05:15:02 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552681685 2406 이승호 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552682207 2021-05-24 05:15:13 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552682207 20403 김진규 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552682540 Sn=2/100(10+210+8)=1104]]> 2021-05-24 05:15:21 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552682540 2412 강정현 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552682696 S100= 100(2x10+99x2)/2
         = 100x218/2
= 10900]]> 2021-05-24 05:15:24 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552682696 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552683249 2422 전수연]]> 2021-05-24 05:15:37 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552683249 2417 김지유 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552685569 2021-05-24 05:16:30 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552685569 2413 고예원 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552686440 일반항:2n+8
제 1항에서 100항까지의 합
100 (10+2×100+8)÷2=
50 (10+208)=50 (218)=10900
따라서 10900개]]> 2021-05-24 05:16:50 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552686440 20415 김소윤 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552688840 a = 10
d = 2
일반항 - 2n + 8
100 ( 20 + 198 ) x 1/2 = 10900

]]> 2021-05-24 05:17:43 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552688840 20420 우이오 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552693254 2021-05-24 05:19:18 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552693254 2419박진희 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552695460 Sn=n{2a+(n-1)d}/2
a=10, d=2
Sn=10900]]> 2021-05-24 05:20:07 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552695460 2402 김종우 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552697607 2021-05-24 05:21:00 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552697607 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552697632 2423 최지현]]> 2021-05-24 05:21:00 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552697632 2412 강정현 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552711023 13+(n--1)5 = 5n+8 = 98
5n = 90
n = 18

18(13+98)/2
=9x111
=999]]> 2021-05-24 05:26:19 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552711023 2413 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552711312 일반항 5n+8
18 (13+98)÷2=9×111=999

]]> 2021-05-24 05:26:22 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552711312 2405 염태인 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552711568 an=5n-2
(18x111)/2=999

]]> 2021-05-24 05:26:28 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552711568 20406 이승호 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552711963 2021-05-24 05:26:36 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552711963 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552712528 2422 전수연
an=5n-2]]> 2021-05-24 05:26:49 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552712528 2419박진희 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552713109 2021-05-24 05:27:02 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552713109 2417 김지유 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552715789 2021-05-24 05:28:11 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552715789 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552717579 2423 최지현]]> 2021-05-24 05:28:56 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552717579 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552719966 2410
첫항:13 공차:5 n:18
18(13+98)/2=999]]> 2021-05-24 05:30:00 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552719966 2408 이해준 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552721218 13~98
5n+8 = 98
n=18
첫째항 13, 제18항 98
Sn-18x(13+98)/2 = 999]]> 2021-05-24 05:30:24 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552721218 2404 심현서 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552723101 13, 18, 23, ..., 98 -> 등차수열 
L_____18개_____I

an : 첫째항 13, 공차 5
=>an = 5n+8
S18 = 9(26+17*5)
=999
]]> 2021-05-24 05:31:14 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552723101 2419 박진희 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552727342 2021-05-24 05:33:06 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552727342 2417 김지유 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552727410 2021-05-24 05:33:08 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552727410 2045 염태인 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552727809 (2+n)(1+2)/2
=(3n+6)/2=24
3n+6=48
따라서 n=14]]> 2021-05-24 05:33:18 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552727809 20420 우이오 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552729515 2021-05-24 05:34:06 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552729515 2412 강정현 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552729860 -6+(n-1)2 = 2n-8
n{-6x2+(n-1)2}/2 = 30
n^2-7n -30 = 0
(n-10)(n+3) = 0
.
. . n = 10

]]> 2021-05-24 05:34:16 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552729860 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552730754 2423 최지현]]> 2021-05-24 05:34:39 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552730754 20403 김진규 -6n+(n+1))2=2n-8 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552730937 N(-12+(n-1)2)/2=30
N=-3,10
N=10]]> 2021-05-24 05:34:45 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552730937 20406 이승호 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552731242 2021-05-24 05:34:53 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552731242 2417 김지유 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552731916 2021-05-24 05:35:12 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552731916 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552737097 2021-05-24 05:37:33 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552737097 https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552740384 1+(n+1)d = 2
(n+1)d = 1
S(n+2) = (n+2){2+(n+1)d}/2 = 24
             = (n+2)3 = 48
             = n+2 = 16
.
. . n=14]]> 2021-05-24 05:39:02 UTC https://padlet.com/shinhyeongpark/keaf4m8utwl7rp3x/wish/1552740384