\(9^{34}-27^{22}+81^{16}.\)
\(=\left(3^2\right)^{34}-\left(3^3\right)^{22}+\left(3^4\right)^{16}\)
\(=3^{68}-3^{66}+3^{64}\)
\(=3^{64}.\left(3^4-3^2+1\right)\)
\(=3^{64}.\left(81-9+1\right)\)
\(=3^{64}.73\)
\(=3^{62}.3^2.73\)
\(=3^{62}.9.73\)
\(=3^{62}.657\)
Vì \(657⋮657\) nên \(3^{62}.657⋮657.\)
\(\Rightarrow9^{34}-27^{22}+81^{16}⋮657\left(đpcm\right).\)
Chúc bạn học tốt!
\( {9^{34}} - {27^{22}} + {81^{16}}\\ = {\left( {{3^2}} \right)^{34}} - {\left( {{3^3}} \right)^{22}} + {\left( {{3^4}} \right)^{16}}\\ = {3^{68}} - {3^{66}} + {3^{64}}\\ = {3^{62}}\left( {{3^6} - {3^4} + {3^2}} \right)\\ = {3^{62}}\left( {729 - 81 + 9} \right)\\ = {3^{63}}.657\)
chia hết cho $657$
