Question

1.25^-9 * (5/4)^8 * 0.8^-3 = ?

Answer 1

$1.25^{-9}*(frac{5}{4})^8*(frac{4}{5})^{-3}$

$(frac{5}{4})^{-9}*(frac{5}{4})^8*(frac{5}{4})^{3}$

$(frac{5}{4})^{-9+8+3} =(frac{5}{4})^2 =frac{25}{16}=1.5625$