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22 tháng 4 2023

image

22 tháng 4 2023

cíuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

22 tháng 4 2023

cíuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

 

12 tháng 2 2019

kế bạn nhé

12 tháng 2 2019

Lê Việt : làm bài đã

22 tháng 1 2018

\(3n+14⋮n+2\)

\(\Rightarrow3\left(n+2\right)+8⋮n+2\)

\(\Rightarrow8⋮n+2\)

\(\Rightarrow n+2\in\text{Ư}\left(8\right)\)

\(\Rightarrow n+2\in\text{{}\pm1;\pm2;\pm4;\pm8\text{ }\)

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

12 tháng 1 2017

a) \(\Rightarrow\left(6n+5\right)-2\left(3n-1\right)⋮3n-1\)

\(\Rightarrow\left(6n+5\right)-\left(6n-2\right)⋮3n-1\)

\(\Rightarrow6n+5-6n+2⋮3n-1\)

\(\Rightarrow7⋮3n-1\)

\(\Rightarrow3n-1\inƯ\left(7\right)=\left(1;-1;7;-7\right)\)

ta có bảng sau :

3n-1         1                        -1                              7                                -7

n              L                        0                               L                                -2

mà \(n\in Z\)

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

12 tháng 1 2017

b) \(\Rightarrow\left(2n-1\right)-2\left(n+1\right)⋮n+1\)

\(\Rightarrow\left(2n-1\right)-\left(2n+2\right)⋮n+1\)

\(\Rightarrow2n-1-2n-2⋮n+1\)

\(\Rightarrow-1⋮n+1\)

\(\Rightarrow n+1\inƯ\left(-1\right)=\left(1;-1\right)\)

ta có bảng sau

n+1                       1                                    -1

n                           0                                    -2

mà \(n\in Z\)

KL :\(n\in\left(0;-2\right)\)