Question

Pas cu pas, va rog.. ​

Answer 1

Explicație pas cu pas:

N=(7n+3)(n-6n)/5 =>

N=(7n+3)*(-5n)/5 =>

N=-n(7n+3)

n€Z => n(7n+3)€Z => N€Z

N=n(7n+3-2n+2)/5n =>N=n(5n+5)/5n =>

N=5(n+1)/5=>N=n+1

n€Z => n+1€Z => N€Z