Question

Cmr:

Answer 1

b) 33^3-8⋮31

  =33^3-2^3

  =33-2=31

  mà 31⋮31

⇒33^2-8⋮31

Answer 2

b)\(33^3-8\)

\(=33^3-2^3\)

\(=\left(33-2\right)\left(33^2+2.33+2^2\right)\)

\(=31\left(33^2+70\right)\) chia hết cho 31

Answer 3

c: \(33^{33}-8\)

\(=\left(33^{11}\right)^3-2^3\)

\(=\left(33^{11}-2\right)\left(33^{22}+2\cdot33^{11}+4\right)\) là hợp số