Question

3n +2 chia hết cho n+1

Answer 1

3n+2 chia hết cho n-1

=>3n-3+5 chia hết cho n-1

=>3.(n-1)+5 chia hết cho n-1

=>5 chia hết cho n - 1

=>n-1\(\in\)Ư(5)={-1;1;-5;5}

=>n\(\in\){0;2;-4;6}

Answer 2

CHÚC BẠN HỌC TỐT

NHỚ TICK CHO MÌNH

Answer 3

\(\left(3n+2\right)⋮\left(n+1\right)\)

vì \(\left(n+1\right)⋮\left(n+1\right)\)

=> \(\left(3n+3\right)⋮\left(n+1\right)\)

=> \(\left(3n+2\right)-\left(3n+3\right)⋮\left(x+1\right)\)

=> \(\left(3n+2-3n-3\right)⋮\left(n+1\right)\)

=> \(-1⋮\left(n+1\right)\)

=> \(n=1\inƯ\left(-1\right)=\left\{\pm1\right\}\)

ta có bảng sau

n+1	-1	1
n	-2	0

vậy n=-2 hoăc n=0