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U1=2. r^0 = 2
---------------------------- :
r^7=8√2
²log 8√2 = 7 ²log r
²log 8 + ²log 2^½ = 7 ²log r
7 ²log r = 3 + ½
²log r = 7/2 : 7
²log r = ½
r=2^½
r=√2
Jadi rasionya √2