Question

[hagdgskd]

Tìm các cặp số nguyên dương x,y thỏa mãn  (2x-1).(y-7)=22

Answer 1

[Nguyễn Đức Trí]

\(\left(2x-1\right)\left(y-7\right)=22\)

\(\Rightarrow\left(2x-1\right);\left(y-7\right)\in\left\{1;2;11;22\right\}\)

\(\Rightarrow\left(x;y\right)\in\left\{\left(1;29\right);\left(\dfrac{3}{2};18\right);\left(6;9\right);\left(\dfrac{23}{2};8\right)\right\}\)

\(\Rightarrow\left(x;y\right)\in\left\{\left(1;29\right);\left(6;9\right)\right\}\left(x;y\inℤ^+\right)\)

Answer 2

[Nguyễn Hùng Sơn]

cách kiếm xu kiểu gì