1 câu trả lời
Đáp án:
-2x=y-1
→x.(y-1)=-2
Do: x,y∈ℤ
-> x, y - 1 ∈ Ư_{(-2)} = {1;-1;2;-2}
Lập bảng giá trị
\begin{array}{|c|c|c|}\hline \text{x}&\text{1}&\text{-1}&\text{2}&\text{-2}\\\hline \text{y - 1}&\text{-2}&\text{2}&\text{-1}&\text{1}\\\hline \text{y}&\text{-1}&\text{3}&\text{0}&\text{2}\\\hline\end{array}
Vậy (x,y) = (1; -1);(-1, 3);(2, 0);(-2,2)
#dariana