Question

Tìm số dư khi 48¹⁵ chia 7

Answer 1

Ta có: \(48\equiv-1\left(mod7\right)\Rightarrow48^{15}\equiv-1\equiv6\left(mod7\right)\)

Vậy 48¹⁵ chia 7 dư 6

Answer 2

\(48\equiv-1\left(mod7\right)\Rightarrow48^{15}\equiv\left(-1\right)^{15}\left(mod7\right)\Rightarrow48^{15}chia7du6\)