<=>2(n+1)-2 chia hết n+1
=>4 chia hết n+1
=>n+1\(\in\){1,2,4,-1,-2,-4}
=>n\(\in\){0,1,3,-2,-3,-5}
Ta có:\(\frac{2n-1}{n+1}=\frac{2n+1-2}{n+1}=\frac{n+1}{n+1}-\frac{2}{n+1}=1-\frac{2}{n+1}\)
Suy ra n+1 thuộc Ư(2)
Ư(2)là:[1,-1,2,-2]
Ta có bảng sau:
n+1 | 1 | -1 | 2 | -2 |
n | 0 | -2 | 1 | -3 |
Vậy n=0;-2;1;-3
ủng hộ mình tròn 740 nha
ta se co :
(2n + 2 ) - 3 chia het cho n + 1
2 . ( n + 1 ) -3 chia het cho n + 1
vi 2 . ( n + 1) cha het cho n + 1
nen 3 chia het cho n +1
n+ 1 \(\in\)U (3)={-3;-1;1;3}
n \(\in\){ -4;-2;0;2}
ban oi tich minh nha , thanks