Ta có:\(8^7-2^{18}\)
\(=\left(2^3\right)^7-2^{18}\)
\(=2^{21}-2^{18}\)
\(=2^{17}\left(2^4-2\right)\)
\(=2^{17}.14⋮14\)
Vậy \(\left(8^7-2^{18}\right)⋮14\)(đpcm)
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Ta có: \(\left(8^7-2^{18}\right)\)
\(=\left(2^3\right)^7-2^{18}\)
\(=2^{17}\left(2^4-2\right)\)
\(=2^{17}.14⋮14\)
Vậy:\(2^{17}.14⋮14\)
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