Question

cho hai số x,y thõa mãn |x + 2| + |y - 1| = 0

Answer 1

|x + 2| + |y - 1| = 0

Ta có: \(\left\{{}\begin{matrix}\left|x+2\right|\ge0\\\left|y-1\right|\ge0\end{matrix}\right.\)

Mà |x + 2| + |y - 1| = 0

⇒ \(\left\{{}\begin{matrix}\text{|x + 2| = 0}\\\left|y-1\right|=0\end{matrix}\right.\)

⇒ \(\left\{{}\begin{matrix}\text{|x + 2| = 0}\\\left|y-1\right|=0\end{matrix}\right.\)

⇒ \(\left\{{}\begin{matrix}x+2=0\\y-1=0\end{matrix}\right.\)

⇒ \(\left\{{}\begin{matrix}x=-2\\y=1\end{matrix}\right.\)

Vậy x = - 2 và y = 1