Jawabanmu

2014-04-10T22:43:06+07:00
A/r x a x ar = 1000
a³ = 10³
a=10

a/r + a+ ar = 35
10/r+10+10r = 35
10/r +10r = 25 (dikali r)
10+ 10r² = 25r
10r²-25r+10=0 (dibagi 5)
2r² - 5r +2=0
(2r-1) (r-2) =0
r = 1/2 atau r =2

r = 1/2 yaitu 20, 10, 5, ..
r = 2 yaitu 5, 10, 20,..
2014-04-11T00:03:59+07:00
A.ar.ar^2 = 1000 (ar)^3 = 1000 ar = 10 a + ar + ar^2 = 35 a+ 10 + 10r = 35 a + 10r = 25 a= 25 - 10r ar= 10 (25-10r)r = 10 -10r^2 + 25r - 10 = 0 2r^2 -5r + 2 = 0 r^2 -5r + 4 =0 (r-4)(r-1)=0 r=2 r=1/2 a=5 a=20 a, ar, ar^2 barisannya》5,10, 20 atau 20,10,5