a)
(0,6)^{-8} * (1\frac{2}{3})^{-8}=(\frac{6}{10}*\frac{5}{3})^{-8}=(\frac{3}{5}*\frac{5}{3})^{-8}=1^{-8}=1
b)
(1\frac{5}{7})^{-2}*(\frac{7}{12})^{-2}=(\frac{12}{7}*\frac{7}{12})^{-2}=1^{-2}=1
c)
3,75^{-3}*(1,6)^{-3}=(3,75*1,6)^{-3}=6^{-3}=(\frac{1}{6})^3=\frac{1}{216}
d)
(1\frac{7}{9})^{-2}*(4,5)^{-2}=(\frac{16}{9}*\frac{45}{10})^{-2}=8^{-2}=(\frac{1}{8})^2=\frac{1}{64}
e)
(2,4)^{-3}:(0,6)^{-3}=(2,4:0,6)^{-3}=4^{-3}=(\frac{1}{4})^3=\frac{1}{64}
f)
(0,2)^{-2}:(0,5)^{-2}=(\frac{0,2}{0,5})^{-2}=(\frac{2}{5})^{-2}=(\frac{5}{2})^2=(2,5)^2=6,25
g)
(1\frac{5}{11})^{-2}:(\frac{4}{11})^{-2}=(\frac{16}{11}:\frac{4}{11})^{-2}=(\frac{16}{11}*\frac{11}{4})^{-2}=4^{-2}=(\frac{1}{4})^2=\frac{1}{16}
h)
(3,6)^{-3}:(0,9)^{-3}=(3,6:0,9)^{-3}=4^{-3}=(\frac{1}{4})^3=\frac{1}{64}