Hi,
nutze die Potenzgesetze
a) (r^{-2})^{-3} = r-2·(-3) = r^6
b) (y+x)^{-3} · (x+y)^2 = (x+y)^{-3} · (x+y)^2 = (x+y)^{-3 + 2} = (x+y)^{-1} = 1/(x+y)
c) ((x+y)^2)^{-4} = (x+y)^{-8}
d) (v+w)(2u)^2 = (v+w)^{4u2}
e) z^{4n-1} · z^{1-n} = z^{4n-1 + 1-n} = z^{3n}
Alles klar?
Grüße