Question

Uwah~~~~~ Gúp mình làm 1 bài nha mng

 

Tìm n thuộc Z biết: 

                           5n - 6  chia hết cho 3n - 2

    Làm nhanh nhanh nha mọi ng` 

 

 

Answer 1

\(5n-6⋮3n-2\)

\(\Rightarrow3\left(5n-6\right)-5\left(3n-2\right)⋮3n-2\)

\(\Rightarrow15n-18-15n+10⋮3n-2\)

\(\Rightarrow-8⋮3n-2\)

\(\Rightarrow3n-2\inƯ\left(-8\right)\)

\(\Rightarrow3n-2\in\left\{1;-1;2;-2;4;-4;8;-8\right\}\)

\(\Rightarrow3n\in\left\{3;1;4;0;6;-2;10;-6\right\}\)

\(\Rightarrow n\in\left\{1;\frac{1}{3};\frac{4}{3};0;2;-\frac{2}{3};\frac{10}{3};-2\right\}\)

Mà n \(\in\) Z

\(\Rightarrow n\in\left\{1;0;2;-2\right\}\)

Answer 2

Wow~~~~

Siêu quá ik nak ^^

Thanks ST nah [≥^.^≤ ]

Answer 3

3[5n-6] chia het cho3n-2

15n-18 chia het cho 3n-2

tach:5.[3n-2]-8 chia het cho 3n-2

vi5.[3n-2] chia het cho 3n-2

nen 8 chia het cho 3n-2

nen3n-2 thuoc uoc cua 8

xong