I think Snow White is very beautiful and kind.
Học đến NLXH chx e?
Vậy n \(\in\) {-6;-4;-2;0}
(2n+9) ⋮ (n+3)
Ta có
2n + 9
= 2(n+3)3
Vì 2(n+3)3 ⋮ (n+3)
Suy ra n+3 \(\in\) Ư(3) = {-3,-1,1,3}
| n+3 | -3 | -1 | 1 | 3 |
| n | -6 | -4 | -2 | 0 |
Vậy n \(\in\) {0;3}