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KONSEP DASAR
PEMBAHASAN SOAL
2
Latihan :
A
1
2
3
Jika bilangan ganjil dikelompokkan seperti berikut:
1 , 3,5 , 7,9,11 , 13,15,17,19 , ⋯ maka suku tengah dari kelompok ke 17 adalah:
Jumlah 𝑛 suku pertama suatu deret geometri adalah : 𝑆𝑛 = 2𝑛
− 1 maka buatlah Persamaan
kuadrat yang akar-akarnya suku ke 4 dan rasio deret tersebut.
Berapakah Banyaknya bilangan bulat positif di antara 200 dan 2000 yang merupakan
kelipatan 6 atau 7 tetapi tidak keduanya ?
4 Jika diketahui barisan 1 , 1 + 2 , 1 + 2 + 3 , 1 + 2 + 3 + 4 , ⋯ maka suku ke 100 adalah :
5
Jumlah dari tiga bilangan yang membentuk deret aritmatika adalah 27. Jika bilangan
terbesar ditambah 12 maka ketiga bilangan tersebut membentuk deret geometri. Bilangan
terkecil dari ketiga bilangan tersebut adalah
7
8
9
Sebuah buku yang seharusnya terdiri dari 20 halaman, ternyata selembar halamannya
hilang, jika seluruh nomor halamannya (setelah halaman hilang) dijumlahkan hasilnya
adalah 195, maka halaman berapa yang hilang?
10 Jika 𝑁 = 6 + 66 + 666 + ⋯ + 666 ⋯ 666 maka berapa kali angka 7 muncul dalam 𝑁
Pecahan
4
37
dapat ditulis dalam bentuk desimal : 0. 𝑎1𝑎2𝑎3 ⋯ maka nilai dari 𝑎2017 adalah
Perhatikan barisan 1,3,3,3,5,5,5,5,5,7,7,7,7,7,7,7, ⋯ maka suku ke 2016 adalah
100𝑥
6 Jumlah dari lima bilangan yang membentuk deret geometri adalah 24. sedangkan jumlah
kebalikan ( 𝑘𝑒𝑏𝑎𝑙𝑖𝑘𝑎𝑛 𝑥 = Τ
1
𝑥 ) dari bilangan tersebut adalah 6 maka berapakah hasil kali
dari kelima bilangan tersebut ?
Tulus Budi Prasetyo

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Barisan & Deret ( Pembinaan KSN-KSM )

  • 2. 2 Latihan : A 1 2 3 Jika bilangan ganjil dikelompokkan seperti berikut: 1 , 3,5 , 7,9,11 , 13,15,17,19 , ⋯ maka suku tengah dari kelompok ke 17 adalah: Jumlah 𝑛 suku pertama suatu deret geometri adalah : 𝑆𝑛 = 2𝑛 − 1 maka buatlah Persamaan kuadrat yang akar-akarnya suku ke 4 dan rasio deret tersebut. Berapakah Banyaknya bilangan bulat positif di antara 200 dan 2000 yang merupakan kelipatan 6 atau 7 tetapi tidak keduanya ? 4 Jika diketahui barisan 1 , 1 + 2 , 1 + 2 + 3 , 1 + 2 + 3 + 4 , ⋯ maka suku ke 100 adalah : 5 Jumlah dari tiga bilangan yang membentuk deret aritmatika adalah 27. Jika bilangan terbesar ditambah 12 maka ketiga bilangan tersebut membentuk deret geometri. Bilangan terkecil dari ketiga bilangan tersebut adalah 7 8 9 Sebuah buku yang seharusnya terdiri dari 20 halaman, ternyata selembar halamannya hilang, jika seluruh nomor halamannya (setelah halaman hilang) dijumlahkan hasilnya adalah 195, maka halaman berapa yang hilang? 10 Jika 𝑁 = 6 + 66 + 666 + ⋯ + 666 ⋯ 666 maka berapa kali angka 7 muncul dalam 𝑁 Pecahan 4 37 dapat ditulis dalam bentuk desimal : 0. 𝑎1𝑎2𝑎3 ⋯ maka nilai dari 𝑎2017 adalah Perhatikan barisan 1,3,3,3,5,5,5,5,5,7,7,7,7,7,7,7, ⋯ maka suku ke 2016 adalah 100𝑥 6 Jumlah dari lima bilangan yang membentuk deret geometri adalah 24. sedangkan jumlah kebalikan ( 𝑘𝑒𝑏𝑎𝑙𝑖𝑘𝑎𝑛 𝑥 = Τ 1 𝑥 ) dari bilangan tersebut adalah 6 maka berapakah hasil kali dari kelima bilangan tersebut ? Tulus Budi Prasetyo