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u7=u5.r(pangkat -n)
625=25.r(pangkat 2)
625:25=r(pangkat 2)
25= r(pangkat 2)
r= akar dari 25= 5
U5= 25,U4=5, U3=1
U7 = ar^6 = 625
U3 ?
U7/U5 = ar^6 /ar^4 = 625/25
r^2 = 25
r = 5
ar^4 = 25
a x 5^4 = 25
a x 625 = 25
a = 25/625 = 1/25
U3 = ar^2 = 1/25 x 5^2 = 1/25 x 25 = 1
(semoga bermanfaat :) )