Question

27-5n⋮n

2n+1⋮6-n

2n+3⋮6-n

2n+3⋮3n+2

Answer 1

a: =>27 chia hết cho n

hay \(n\in\left\{1;-1;3;-3;9;-9;27;-27\right\}\)

b: =>2n-12+13 chia hết cho n-6

=>\(n-6\in\left\{1;-1;13;-13\right\}\)

hay \(n\in\left\{5;7;19;-7\right\}\)

c: =>2n-12+15 chia hết cho n-6

=>\(n-6\in\left\{1;-1;3;-3;5;-5;15;-15\right\}\)

hay \(n\in\left\{7;5;9;3;11;1;21;-9\right\}\)

d: =>6n+9 chia hét cho 3n+2

=>\(3n+2\in\left\{1;-1;5;-5\right\}\)

hay \(n\in\left\{-\dfrac{1}{3};-1;1;-\dfrac{7}{3}\right\}\)

Answer 2

chứng minh