Los ejercicios ocho, nueve y diez:
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log A = log 3^2 + log 4^(1/2) - log 2^3
log A = log (3^2 * 4^(1/2) / 2^3)
log A = log (9 * 2 / 8)
log A = log 9/4
A = 9/4
2,5^x = 0,0087
log 2,5^x = log 0,0087
xlog 2,5 = log 0,0087
x = log 0,0087/log 2,5
x = -5,18
e^-x = 425
ln e^-x = ln 425
-xln e = ln 425
-x(1) = 6,05
x = -6,05