Question

Tìm x,y thuộc Z, biết:
a) xy+x=3
b) 5+xy=y
c) 2x+3+y=xy

 

Answer 1

xy+x=3 x(y+1)=3 => x,y+1 € U(3) x€ {-1,1,-3,3} y+1 € { -1,1,-3,3} y €{-2,0,-4,2}

Answer 2

a,Ta có:\(xy+x=3\)

\(\Leftrightarrow x\left(y+1\right)=3\)

Vì x,y thuộc Z \(\hept{\begin{cases}x\\y+1\end{cases}}\in Z\)

\(\Rightarrow x;y+1\inƯ\left(3\right)\)

\(\Rightarrow x;y+1\in\left\{\pm1;\pm3\right\}\)

\(\Rightarrow\orbr{\begin{cases}x=1\\y+1=3\Rightarrow y=2\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=-1\\y+1=-3\Rightarrow y=-4\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=3\\y+1=1\Rightarrow y=0\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=-3\\y+1=-1\Rightarrow y=-2\end{cases}}\)