Question

Mng giúp mình với ạ

Answer 1

b: \(\Leftrightarrow x+2\in\left\{1;-1;3;-3\right\}\)

hay \(x\in\left\{-1;-3;1;-5\right\}\)

Answer 2

c)(x-1)(y-2)=19

x-1=19

x=20

y-2=19

y=21

vậy x;y=(20;21)