Question

Cho n - m \(⋮\) 6

Chứng minh : a, n + 5m \(⋮\) 6

b, n +17m \(⋮\) 6

c, n - 13m \(⋮\) 6

Answer 1

a)Cho n - m 6

Chứng minh : a, n + 5m 6

Ta có: n - m 6

=>n-m+6m6

=>n+5m6(đpcm)

b, n +17m 6

Ta có: n - m 6

=>n-m+18m6

=>n +17m 6(đpcm)

c, n - 13m 6

Ta có: n - m 6

=>n-m-12m6

=> n - 13m 6(đpcm)

Answer 2

a, Ta có :

\(n-m⋮6\)

\(\Leftrightarrow n-m+6m⋮6\)

\(\Leftrightarrow n+5m⋮6\)

\(\rightarrowđpcm\)

b, Ta có :

\(n-m⋮6\)

\(\Leftrightarrow n-m+18m⋮6\)

\(\Leftrightarrow n+17m⋮6\)

\(\rightarrowđpcm\)

c, Ta có :

\(n-m⋮6\)

\(\Leftrightarrow n-m-12m⋮6\)

\(\Leftrightarrow n-13m⋮6\)

\(\rightarrowđpcm\)