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\(A=4^{17}+4^{18}+4^{19}+4^{20}+4^{17}\left(999-4\right)\)
\(=4^{17}+4^{18}+4^{19}+4^{20}+999.4^{17}-4^{18}\)
\(=4^{17}+4^{19}+4^{20}+999.4^{17}\)
\(=4^{17}\left(1+4^2+4^3\right)+999.4^{17}\)
\(=81.4^{17}+999.4^{17}\)
\(\left\{{}\begin{matrix}81⋮9\\999⋮9\end{matrix}\right.\Rightarrow A⋮9\)
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\(a)10^{19}+10^{18}+10^{17}\\ =10^{17}\cdot\left(10^2+10+1\right)\\ =10^{17}\cdot111=10^{16}\cdot2\cdot5\cdot111\\ =10^{16}\cdot2\cdot555\\ \Rightarrow10^6\cdot2\cdot555⋮555\\ hay:10^{19}+10^{^{ }18}+10^{17}⋮555\)
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a) 1019 + 1018 + 1017 = 1017(100 + 10 + 1)
= 1016 . 2 . 5 . 111
= 1016 . 2 . 555 \(⋮\) 555(đpcm)