Ta có\(1911\equiv0\left(mod7\right)\)
=> \(1911^{1945}\equiv0\left(mod7\right)\)
\(1975\equiv1\left(mod7\right)\)
=> \(1975^{2000}\equiv1\left(mod7\right)\)
\(344\equiv1\left(mod7\right)\)
=> \(1911^{1945}+1975^{2000}-344\equiv0+1-1\left(mod7\right)\equiv0\left(mod7\right)\)
=> \(1911^{1945}+1975^{2000}-344⋮7\)
=> đpcm
k cho mik nha bạn