diketahui barisan geometri U1= 2 dan U2=10. tentukan U3,U4,U5
Matematika
urifahningsih
Pertanyaan
diketahui barisan geometri U1= 2 dan U2=10. tentukan U3,U4,U5
1 Jawaban
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1. Jawaban onnyfathi
BARISAN GEOMETRI
U1 = a = 2
U2 = ar = 10
U2/U1 = ar/a = 10/2
» r = 5
Un= ar^n-1
a) U3 = ar^3-1
= ar^2
= 2×5^2
= 2×25
= 50
b) U4 = ar^4-1
= ar^3
= 2×5^3
= 2×125
= 250
c) U5 = ar^5-1
= ar^4
= 2×5^4
= 2×625
= 1.250