Question

Tìm x, y ∈ Z, biết:

a, x.y = -9

b, (2x + 1).(2y - 5) = 15

Answer 1

a: \(\left(x,y\right)\in\left\{\left(1;-9\right);\left(-9;1\right);\left(-1;9\right);\left(9;-1\right);\left(3;-3\right);\left(-3;3\right)\right\}\)