a) Ta có :
7160 + 7159 - 7158
= 7158 x (72 + 7 - 1)
= 7158 x (49 + 7 - 1)
= 7158 x 55 chia hết cho 55 (ĐPCM)
b) Ta có :
165 + 215
= (24)5 + 215
= 220 + 215
= 215 x (25 + 1)
= 215 x (32 + 1)
= 215 x 33 chia hết cho 33 (ĐPCM)
c) Ta có :
1253 + 2 x 254
= (53)3 + 2 x (52)4
= 59 + 2 x 58
= 58 x (5 + 2)
= 58 x 7 chia hết cho 7 (ĐPCM)
Ủng hộ mk nha ^_^ *_*
b) \(16^5+2^{15}⋮33\)
\(=\left(2^4\right)^5+2^{15}\)
\(=2^{20}+2^{15}\)
\(=2^{15}.\left(1+2^5\right)\)
\(=2^{15}.33⋮33\)