a)\(2n+2⋮2n-1\)
\(\Rightarrow2n-1+3⋮2n-1\)
\(\Rightarrow3⋮2n-1\)
\(\Rightarrow2n-1\inƯ\left(3\right)=\left\{\pm1;\pm3\right\}\)
\(\Rightarrow2n-1=1;-1;3;-3\)
\(\Rightarrow2n=2;0;4;-2\)
\(\Rightarrow n=1;0;2;-1\)
b)\(2n-5⋮n+3\)
\(\Rightarrow2\left(n+3\right)-11⋮n+3\)
\(\Rightarrow11⋮n+3\)
\(\Rightarrow n+3\inƯ\left(11\right)=\left\{\pm1;\pm11\right\}\)
\(\Rightarrow n+3=1;-1;11;-11\)
\(\Rightarrow n=-2;-4;8;-14\)
Mình k đây nè,lần sau nhớ k cho mình nhé
Có ai bt viết dấu chia hết ko ??? Chỉ cho mk vs, mk ko bt .