Jawabanmu

2014-06-11T10:33:05+07:00
U5 / U2 = 1250/10 = a x  r^{4} / a x r
125 =  r^{3}
r = ∛125
r = 5

U2 = a x r
10 = a x 5
 a  = 2

U4 = a x r³
U4 = 2 x 5³
U4 = 2 x 125
U4 = 250
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