giúp mình nhé ai làm được thi kb nhé

a) \(6⋮\left(x-1\right)\)

\(\Rightarrow\left(x-1\right)\inƯ\left(6\right)\)

\(Ư\left(6\right)=\left\{1;2;3;6\right\}\)

Có: \(\left(x-1\right)\inƯ\left(6\right)\)

\(\Rightarrow\left(x-1\right)\in\left\{1;2;3;6\right\}\)

\(\Rightarrow x-1=1;x-1=2;x-1=3;x-1=6\)

\(\Leftrightarrow x=2;x=3;x=4;x=7\)

\(\Rightarrow x\in\left\{2;3;4;7\right\}\)

b) \(15⋮\left(2x+1\right)\)

\(\Rightarrow\left(2x+1\right)\inƯ\left(15\right)\)

\(Ư\left(15\right)=\left\{1;3;5;15\right\}\)

Có: \(\left(2x+1\right)\inƯ\left(15\right)\)

\(\Rightarrow\left(2x+1\right)\in\left\{1;3;5;15\right\}\)

\(\Rightarrow2x+1=1;2x+1=3;2x+1=5;2x+1=15\)

\(\Leftrightarrow x\in\varnothing;x=1;x=2;x=7\)

\(\Rightarrow x\in\left\{1;2;7\right\}\)

a) x Î Ư(6) = {-6; -3; -2; -l; l; 2; 3; 6}.

b) x + l Î Ư (8) = {- 8; -4; -2; -1; 1; 2; 4; 8}. Từ đó tìm được

x Î{-9; -5; -3; -2; 0; 1; 3; 7}.

c)  x - 2 Î Ư(10) = {-10; -5; - 2; -1; 1; 2; 5; 10). Từ đó tìm được

x Î {-8; -3; 0; l; 3; 5; 7; 12}.

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tìm n 

hả 

đúng ko 

pạn

a)  6\(⋮\)x-1<=>x-1\(\inướccủa6\)

<=> Ư(6)=(1;2;3;6)

x-1=1=>x=2

x-1=2=>x=3

x-1=3=>x=4

x-1=6=>x=7

14\(⋮2x+3\Rightarrow2x+3\inƯ\left(14\right)\)

Ư(14)=(1;2;7;14)

2x+3=1=>x=-1

2x+3=2=>x=-1/2

2x+3=7=>x=2

2x+3=14=>x=11/2

b)n+6 chia het cho n-1

​=(n-1)+7 chia het cho n-1

​suy ra : 7 chia het cho n-1

​n=7+1

​n=8

a)12-n chia het cho n-1

​=11-(n-1) chia het cho n-1

​suy ra :11 chia het cho n-1

​n=11+1

n=12

trả lời 

n=12

chúc bn 

hc tốt

a,Ta có:3n+24 chia hết cho n-4

=>3n-12+36 chia hết cho n-4

=>3(n-4)+36 chia hết cho n-4

Mà 3(n-4) chia hết cho n-4

=>36 chia hết cho n-4

=>n-4\(\in\)Ư(36)={-36,-18,-12,-9,-6,-4,-3,-2,-1,1,2,3,4,6,9,12,18,36}

=>n\(\in\){-32,-14,-8,-5,-2,0,1,2,3,5,6,7,8,10,13,16,22,40}

n,n-6 chia hết cho n-1

=>n-1-5 chia hết cho n-1

Mà n-1 chia hết cho n-1

=>5 chia hết cho n-1

=>n-1\(\in\)Ư(5)={-5,-1,1,5}

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