Question

(2^9×3^9×4^9):(2^7×3^8×4^9)

Answer 1

(2^9×3^9×4^9):(2^7×3^8×4^9)=
$(2^9:2^7)*(3^9:3^8)*(4^9:4^9)=$
$=2^{9-7}*3^{9-8}*4^{9-9}=$
$=2^2*3^1*4^0=$
=4*3*1
=12