https://padlet.com/shinhyeongpark/17bkjayceaco0993 en-us 2021-05-20 04:38:23 UTC 2023-03-09 08:35:03 UTC hello@padlet.com https://padlet.net/icons/png/1f6f4.png shinhyeongpark https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1542404749 2021-05-20 04:38:23 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1542404749 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552304172 첫번째 항 : 10
공차 : 2
50*218=10900]]> 2021-05-24 02:19:55 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552304172 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552304302 2021-05-24 02:19:58 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552304302 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552304799 첫항이 10, 공차가 2인 등차수열이므로 100항까지의 합은 100{20+2(100-1)} / =10900]]> 2021-05-24 02:20:12 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552304799 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552308844 2021-05-24 02:21:47 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552308844 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552309241 첫항이 10, 공차가 2인 등차수열의 제 1항부터 100항까지의 합

100[10+10+(100-1)2]/2=10900]]> 2021-05-24 02:21:51 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552309241 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552314225 초항 10 공차 2
100X(20+99X2)
------------------------
         2
=100X109=10900]]> 2021-05-24 02:23:52 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552314225 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552318326 2322 이은지
d=2
a10
100(20+2(100-1)=10900

]]> 2021-05-24 02:25:32 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552318326 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552332440 3+5(n-1)=5n-2 
두자리수->
3항(13)부터 20항(98)까지
총 18항!!
18(13+98)/2=999

]]> 2021-05-24 02:31:14 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552332440 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552332580 초항 13 공차 5
끝항 98까지 18개(2X5+3 ~19X5+3)
18X(13+98)/2
=9X111=999]]> 2021-05-24 02:31:16 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552332580 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552333985
두 자리 자연수 중에서 5로 나누었을 때 나머지가 3인 수는 13, 18, 23 ...98 까지

첫항이 13이고 공차가 5인 등차수열이다. ]]> 2021-05-24 02:31:51 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552333985 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552336004 첫항이 13, 공차가 5, n=18
18{13+(98} / 2=999]]> 2021-05-24 02:32:43 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552336004 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552336368 13+(n-1)5 = 5n+8
5n+8= 98
5n=90
n=18
18(13+98)/2=999
999]]> 2021-05-24 02:32:52 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552336368 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552336558
첫째항 13, 공차 5
5n+8=98, 98은 제 18항

18(13+98)/2 = 999]]> 2021-05-24 02:32:57 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552336558 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552339274 2318 박수빈]]> 2021-05-24 02:33:57 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552339274 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552340434 첫째항=13, 마지막항-98,n=18
18(13+98)/2=999]]> 2021-05-24 02:34:24 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552340434 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552342480 2021-05-24 02:35:10 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552342480 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552342963 2322 이은지
d=5
a=13
18(13+98)2=999]]> 2021-05-24 02:35:20 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552342963 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552349217 2021-05-24 02:38:00 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552349217 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552349334 2021-05-24 02:38:03 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552349334 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552349482 nX(-12+(n-1)2)=60
n(2n-14)=60
2n^2-14n-60=0
n^2-7n-30=0
(n-10)(n+3)=0
자연수 n=10]]> 2021-05-24 02:38:06 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552349482 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552349694 a=10 d=2
50X{20+2(100-1)}=50X218=10900]]> 2021-05-24 02:38:12 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552349694 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552352909 첫째항 = 13 공차 = 5 
마지막 항 = 98 
18(13+98)/2 = 9x11 = 999 

]]> 2021-05-24 02:39:29 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552352909 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552353661 n(-12+(n-1)2)=60
n^2-7n-30=0
n=10]]> 2021-05-24 02:39:48 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552353661 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552354664 d(n+1)=1
Sn=(n+2)(1+2)/2
3(n+2)=48
n+2=16 n=14?]]> 2021-05-24 02:40:13 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552354664 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552355502 2318 박수빈]]> 2021-05-24 02:40:35 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552355502 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552355846 2021-05-24 02:40:44 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552355846 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552357386 2318 박수빈]]> 2021-05-24 02:41:27 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552357386 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552359240 2322이은지
a=-6
d=2
n(-12+2n-2)/2=30
n(-14+2n)/2=30
n=10

]]> 2021-05-24 02:42:20 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552359240 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552362346 (n+2)(1+2)=48
3(n+2)=48
3n=42
n=14]]> 2021-05-24 02:43:40 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552362346 https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552376084 2n제곱-14n=60 식을 
n제곱-7n-30=0으로 정리하고 인수분해하면 
n은 10또는 -3인데 음수가 불가능하므로 10이다

]]> 2021-05-24 02:49:44 UTC https://padlet.com/shinhyeongpark/17bkjayceaco0993/wish/1552376084