Ta có: 128 . 1816 = (22.3)8 . (32.2)16 = 216 . 38 . 332 . 216 = (216 . 216).(38.332)= 340 . 232 (đpcm)
Ta có : \(VP=12^8.18^{16}=\left(2^2.3\right)^8.\left(2.3^2\right)^{16}\)
\(=2^{16}.3^8.2^{16}.3^{32}\)
\(=3^{40}.2^{32}=VT\)
\(\Rightarrowđpcm\)
128.1816 = (3.22)8.(2.32)16
= 38.(22)8.216.(32)16
=38.216.216.332
=(38.332).(216.216)
=340.232 (ĐPCM)
Vậy 128.1816 = 340.232
\(12^8.18^{16}=\left(3.2^2\right)^8.\left(3^2.2\right)^{16}=3^8.2^{16}.3^{32}.2^{16}=\left(3^8.3^{32}\right).\left(2^{16}.2^{16}\right)=3^{40}.2^{32}\)