\(2x-1⋮x+1\)
\(\Rightarrow2x+2-3⋮x+1\)
\(\Rightarrow2\left(x+1\right)-3⋮x+1\)
\(2\left(x+1\right)⋮x+1\)
\(\Rightarrow3⋮x+1\)
\(\Rightarrow x+1\inƯ\left(3\right)\)
\(x\inℤ\Rightarrow x+1\inℤ\)
\(\Rightarrow x+1\in\left\{-1;1;-3;3\right\}\)
\(\Rightarrow x\in\left\{-2;0;-4;2\right\}\)
Vì 2x-1chia hết cho x+1
=>2{x+1}-3chia hết cho x+1[mà 2[x+1]chia hết cho x+1]
=>-3 chia hết cho x+1
=>x+1e Ư[-3]
x+1 e Ư [-3;-1;1;3}
=> x e Ư [ -4;-2;0;2]
Vậy x ...........
mn sai ròi x^2 chớ ko phải 2x đưu