Suatu barisan geometri dengan U3 = 3 dan U6 = 81. Suku ke-9 barisan tersebut adalah. . .
IcukSugiarto
![subtitusi\ persamaan:\\a.r^{5}=81\\a.r^{2}.r^{3}=81\\3.r^{3}=81\\r^{3}= \frac{81}{3}\\r^{3}= 27\\r= \sqrt[3]{27}\\r=3](https://tex.z-dn.net/?f=subtitusi%5C+persamaan%3A%5C%5Ca.r%5E%7B5%7D%3D81%5C%5Ca.r%5E%7B2%7D.r%5E%7B3%7D%3D81%5C%5C3.r%5E%7B3%7D%3D81%5C%5Cr%5E%7B3%7D%3D+%5Cfrac%7B81%7D%7B3%7D%5C%5Cr%5E%7B3%7D%3D+27%5C%5Cr%3D+%5Csqrt%5B3%5D%7B27%7D%5C%5Cr%3D3 "subtitusi\ persamaan:\\a.r^{5}=81\\a.r^{2}.r^{3}=81\\3.r^{3}=81\\r^{3}= \frac{81}{3}\\r^{3}= 27\\r= \sqrt[3]{27}\\r=3")
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