Jumlah 8 suku dari Suku I deret: 8,4,2 adalah.

Jumlah 8 suku dari Suku I deret: 8,4,2 adalah.

Jawabannya adalah 255/64

Konsep barisan geometri :
r = Un/U(n-1)
Sn = a(1-rⁿ)/(1-r), untuk r<1
Keterangan :
Un = suku ke-n
Sn = jumlah n suku pertama
r = rasio
a = U1 = suku pertama

Jawab :
a = 8

r = U2/U1
= 4/8
= 1/2

S8 = 8(1-(1/2)⁸)/(1-1/2)
= 8(1-1/256)/(2/2 – 1/2)
= 8(256/256-1/256)/(1/2)
= 8/2 (255/256)
= 4(255/256)
= 255/64

Jadi jumlah 8 sukunya adalah 255/64

Baca Juga :  31 She started to learn the violin when she was seven. BEEN She_______ the violin since she was seven. 32 I don’t often get help from him with the washing up. USUALLY He _______ help with the washing up. 33 They came back from their holidays not long ago. JUST They _____ back from their holidays. 34 It bothers me that Anita criticises the way I speak. ALWAYS Anita _____ the way I speak – it really bothers me! 35 It has been at least two weeks since the last time Ingrid called me. FOR Ingrid_______at least two weeks. 36 A lot of my classmates have started to become interested in YouTuber books this term. GETTING A lot of my classmates________YouTuber books recently.

Leave a Reply

Your email address will not be published.