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^x= 4
5 log 625 = 4
5^4 = 625
b. 1/x^4 = 1/625
dikali silang = 625 = X^4
X= akar pangkat 4 dari 625 = 5
c. x^-3 = 1/8
1/x^3 = 1/8
dikali silang = 8 = X^3
X= akar pangkat 3 dari 8 = 2
d. (1/x)^3=1/1000
1/x^3=1/10^3
di akar 3 keduanya
1/x = 1/10
dikali silang = 10 = X
X = 10