85 + 211= 215 + 211= 211 ( 24 + 1) = 211.17 chia hết cho 17
85+211=(23)5+211
=215+211
=211(24+1)
=211.17 chia hết cho 17
đ/s:..........................
**** nha
\(8^5+2^{11}=\left(2^3\right)^5+2^{11}=2^{15}+2^{11}=2^{11}\left(2^4+1\right)=2^{11}.17\)chia hết cho 17
Vậy \(8^5+2^{11}\)chia hết cho 17