180 Days of Practice for Fifth Grade (Set of 3), 5th Grade Workbooks for Kids Ages 9-11, Inc

180 Days of Practice for Fifth Grade (Set of 3), 5th Grade Workbooks for Kids Ages 9-11, Inc

Matematika Sekolah Menengah Pertama Diketahui deret 5 10 20 40 .... jumlah 9 suku pertama deret tersebut adalah a. 252 b.334 c.428 d.649

Diketahui deret 5 10 20 40 .... jumlah 9 suku pertama deret tersebut adalah a. 252 b.334 c.428 d.649

Jawaban:

DerGeo =

a = 5

r = 2

S9 = a(rⁿ - 1)/(r-1)

S9 = 5(2^9 - 1)

S9 = 2555