Question

chứng tỏ rằng

12⁸.9¹² = 18¹⁶

Answer 1

\(VT=12^8.9^{12}=\left(2^2.3\right)^8.\left(3^2\right)^{12}=2^{16}.3^8.3^{24}=2^{16}.3^{32}=2^{16}.\left(3^2\right)^{16}=2^{16}.9^{16}=\left(2.9\right)^{16}=18^6=VP\)

Answer 2

Xét: \(12^8\cdot9^{12}=\left(2^2\cdot3\right)^8\cdot\left(3^2\right)^{12}\)

\(=2^{16}\cdot3^8\cdot3^{24}=2^{16}\cdot3^{32}\)

\(=2^{16}\cdot\left(3^2\right)^{16}=2^{16}\cdot9^{16}=18^{16}\)

Answer 3

Ta có:

\(12^8.9^{12}=2^{16}.9^4.9^{12}=2^{16}.9^{16}=\left(2.9\right)^{16}=18^{16}\left(đpcm\right)\)