Câu hỏi của nguyễn diệu thúy

Question

cho A=n+2/n-5(n thuocz,n khacs5)tim x dea thuoc z

Mới vô · Accepted Answer

$A=\dfrac{n+2}{n-5}\Rightarrow n+2⋮n-5\ n+2=n-5+7⋮n-5\Rightarrow7⋮n-5\Rightarrow n-5\inƯ\left(7\right)$

$Ư\left(7\right)=\left\{-7;-1;1;7\right\}$

n-5	-7	-1	1	7
n	-2	4	6	12

Câu trả lời:

$A=\dfrac{n+2}{n-5}\Rightarrow n+2⋮n-5\ n+2=n-5+7⋮n-5\Rightarrow7⋮n-5\Rightarrow n-5\inƯ\left(7\right)$

$Ư\left(7\right)=\left\{-7;-1;1;7\right\}$

n-5	-7	-1	1	7
n	-2	4	6	12