e) log 10 (10^-12) = -12 weil 10^-12 = 10^-12
f) log 0,2 (0,008) = 3 weil 0,2^3 = 0,003
g) log 5 (0,2) = -1 weil 5^-1 = 0,2
h) log 3 (1/81) = -4 weil 3^-4 = 1/81
i) log 8 (2) = 1/3 weil 2^3 = 8
j) log 1024 (4) = 1/5 weil 4^5 = 1024
k) log 81 (1/3) = -1/4 weil (1/3)^-4 = 81
l) log 125 (1/5) = -1/3 weil (1/5)^-3 = 125