Giải:
\(102=2.3.17\)
Ta có:
\(220\equiv0\left(mod2\right)\) nên \(220^{11969}\equiv0\left(mod2\right)\)
\(119\equiv1\left(mod2\right)\) nên \(119^{69220}\equiv1\left(mod2\right)\)
\(69\equiv-1\left(mod2\right)\) nên \(69^{220119}\equiv-1\left(mod2\right)\)
\(\Rightarrow A\equiv0\left(mod2\right)\) Hay \(A⋮2\)
Tương tự ta cũng có: \(\left\{{}\begin{matrix}A⋮3\\A⋮17\end{matrix}\right.\)
Mà \(\left(2;3;17\right)=1\Rightarrow A⋮2.3.17=102\)
Vậy \(A=220^{11969}+119^{69220}+69^{220119}⋮102\) (Đpcm)
Đúng 0
Bình luận (1)