Question

Giúp t điiii🙏😳

Answer 1

Bài 3:

a: =>5 chia hết cho n

=>\(n\in\left\{1;-1;5;-5\right\}\)

b: =>-7 chia hết cho n

=>\(n\in\left\{1;-1;7;-7\right\}\)

c: =>n+5+4 chiahết cho n+5

=>\(n+5\in\left\{1;-1;2;-2;4;-4\right\}\)

=>\(n\in\left\{-4;-6;-3;-7;-1;-9\right\}\)

d: =>n-2+11 chia hết cho n-2

=>\(n-2\in\left\{1;-1;11;-11\right\}\)

=>\(n\in\left\{3;1;13;-9\right\}\)