Question

[Trần Ngọc Bích Vân]

tim x, y thuoc Z biet : x.y - 2.x - 3.y = 5

Answer 1

[bảo nam trần]

xy - 2x - 3y = 5

<=> xy - 2x - 3y + 6 = 11

<=> x(y - 2) - 3(y - 2) = 11

<=> (x - 3)(y - 2) = 11

x - 3	1	-1	11	-11
y - 2	11	-11	1	-1
x	4	2	14	-8
y	13	-9	3	1

Vậy...