Question

Tìm cắp số nguyên (x,y) sao cho: (x - 1)y = 2

Answer 1

\(\Leftrightarrow\left(x-1;y\right)\in\left\{\left(1;2\right);\left(2;1\right);\left(-1;-2\right);\left(-2;-1\right)\right\}\)

hay \(\left(x,y\right)\in\left\{\left(2;2\right);\left(3;1\right);\left(0;-2\right);\left(-1;-1\right)\right\}\)