a, 2^9 . 4^5
=2^9 . (2^2)^5
= 2^9. 2^10
=2^19
b, 27^4 :81^3
=(3^3)^4 : (3^4)^3
= 3^12 : 3^12
= 1
c,72^5 :9^5
= (2^3 . 3^2)^5 :(3^2)^5
= 2^10. 3^10 : 3^10
= 2^10
Học tốt ~
\(a,2^9.4^5=2^9.\left(2^2\right)^5=2^9.2^{10}=2^{19}\)
\(b,27^4:81^3=\left(3^3\right)^4:\left(3^4\right)^3=3^{12}:3^{12}=1\)
\(c,72^5:9^5=\left(72:9\right)^5=8^5\)
a. 524288
b.1
c.32768
d.328593657