Question

calcule as porcentagens:
a.y expoente a 4 dividindo y expoente a 7=
b.9 expoente a 2 multiplicando 9 expoente a 2=
c.9 expoente a 2 dividindo 9 expoente a 2=

Answer 1

$a)\\\\\frac{y^4}{y^7}~=~\frac{1}{y^{7}.y^{-4}}~=~\frac{1}{y^{7-4}}~=~\boxed{\frac{1}{y^{3}}}~ou~\boxed{y^{-3}}\\\\\\b)\\\\9^2~.~9^2~=~9^{2+2}~=~9^4~=~\boxed{6561}\\\\\\c)\\\\\frac{9^2}{9^2}~=~\frac{9^2~.~9^{-2}}{1}~=~9^{2-2}~=~9^0~=~\boxed{1}$