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DT
0
ND
3
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 :\(n\in\left(0;-2\right)\)
VH
0
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