Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
S0AL MATEMATIKA YANG TAU MASVK ! 5 bintang.?
Tentukan 4 suku suatu barisan yang suku ke - n nya dinyatakan dengan :
a. 4n + 5
b. 5 * 2n
c. Satu per dua n ( n + 1 )
d. ( n - 1 ) ( 2n + 1 )
3 Answers
- Saumi AmraniLv 41 decade agoFavorite Answer
Karena suku ke-n ( Un ) =
a. 4n +5
maka U1 = 4(1) + 5 = 4 + 5 = 9
U2 = 4(2) + 5 = 8 + 5 = 13
U3 = 4(3) + 5 = 12 + 5 = 17
U4 = 4(4) + 5 = 16 + 5 = 21
Maka, 4 suku barisan tersebut 9, 13, 17, 21
b. 5 ^ 2n
U1 = 5 ^ 2(1) = 5 ^ 2 = 25
U2 = 5 ^ 2(2) = 5 ^ 4 =625
U3 = 5 ^ 2(3) = 5 ^ 6 = 15625
U4 = 5 ^ 2(4) = 5 ^ 8 = 390625
c. 1/2 n^2 + n
U1 = 1/2 x 1^2 + 1 = 3/2
U2 = 1/2 x 2^2 + 2 = 4
U3 = 1/2 x 3^2 + 3 = 15/2
U4 = 1/2 x 4^2 + 2 = 10
d. 2n^2 - n - 1
U1 = 2 x 1^2 - 1 -1 = 0
U2 = 2 x 2^2 - 2-1 = 5
U3 = 2 x 3^2 - 3 -1 = 14
U4 = 2 x 4^2 - 4 -1 = 27
SEMOGA MEMBANTU
- 1 decade ago
un=4n+5
u1= 4+5 =9
u2= 8+5 =13
u3= 12+5 =17
u4= 16+5 =21
un=5*2n
u1=5*2=10
u2=5*4=20
u3=5*6=30
u4=5*8=40
un=1/2n(n+1)
u1=1/2(1+1)=1
u2=1(2+1)=3
u3=1,5(3+1)=6
u4=2(4+1)=10
un=(n-1)(2n+1)
u1=(1-1)(2+1)=3
u2=(2-1)(4+1)=5
u3=(3-1)(6+1)=14
u4=(4-1)(8+1)=27
Source(s): y!m nundha_anyund
