Question

$5cdot 27^{2/3} - 9 cdot 32^{3/5}$

Answer 1

27=3^3, 32=2^5, (a^x)^y=a^(xy)

5*(3^3)^(2/3)-9*(2^5)^(3/5)=5*3^2-9*2^3=5*9-9*8=45-72=-27