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9 = a.r
U5 = a.r^4
243 = a.r^4
rasio
U5/U2 = ar^4/ar = r^3
243/9 = 27
maka r^3 = 27
maka r = akar pangkat 3 dari 27 = 3
maka rasio=3
simplenya, karna itu cuma u2 dan u5,, maka lgsg km tebak aj rasionya