a)
\frac{1}{9}=(\frac{1}{3})^2=(\frac{3}{1})^{-2}=3^{-2}
b)
0,25=0,5^2=(\frac{1}{2})^2=2^{-2}
c)
\frac{1}{11}=(\frac{1}{11})^1=(\frac{11}{1})^{-1}=11^{-1}
d)
0,04=(0,2)^2=(\frac{2}{10})^2=(\frac{10}{2})^{-2}=5^{-2}
e)
\frac{1}{49}=(\frac{1}{7})^2=7^{-2}
f)
0,000001=10^{-6}
g)
0,125=\frac{125}{1000}=(\frac{5}{10})^3=(\frac{10}{5})^{-3}=2^{-3}
h)
0,008=\frac{8}{1000}=(\frac{2}{10})^3=(\frac{10}{2})^{-3}=5^{-3}