a: =3^4*3^9=3^13
b: =2^10:2^7*2^20*2^30=2^53
c: =2^12*2^10*2^30=2^52
a) \(9^2\cdot27^3\)
\(=\left(3^2\right)^2\cdot\left(3^3\right)^3\)
\(=3^4\cdot3^9\)
\(=3^{4+9}\)
\(=3^{13}\)
b) \(4^5:2^7\cdot4^{10}\cdot2^{30}\)
\(=\left(2^2\right)^5:2^7\cdot\left(2^2\right)^{10}\cdot2^{30}\)
\(=2^{10}:2^7\cdot2^{20}\cdot2^{30}\)
\(=2^3\cdot2^{20}\cdot2^{30}\)
\(=2^{3+20+30}\)
\(=2^{53}\)
c) \(64^2\cdot4^5\cdot2^{30}\)
\(=\left(2^6\right)^2\cdot\left(2^2\right)^5\cdot2^{30}\)
\(=2^{12}\cdot2^{10}\cdot2^{30}\)
\(=2^{12+10+30}\)
\(=2^{52}\)