Question

Tìm x,y € Z biết:

(X - 1)×(1 -  y) = 0

Answer 1

Ta có:\(\left(x-1\right)\left(1-y\right)=0\)

\(\Rightarrow\hept{\begin{cases}x-1=0\\1-y=0\end{cases}}\)\(\Leftrightarrow\hept{\begin{cases}x=0+1\\y=1-0\end{cases}}\)\(\Rightarrow\hept{\begin{cases}x=1\\y=1\end{cases}}\)

Vậy x=1 và y=1

Answer 2

\(\Rightarrow\orbr{\begin{cases}x-1=0\\1-y=0\end{cases}}\Rightarrow\orbr{\begin{cases}x=1\\y=1\end{cases}}\)

Answer 3

Giả

\(\left(x-1\right)\left(1-y\right)=0\Leftrightarrow\orbr{\begin{cases}x-1=0\\1-y=0\end{cases}\Rightarrow\orbr{\begin{cases}x=1\\y=1\end{cases}}}\)i :

Vậy x = 1; y = 1

Answer 4

\(\left(x-1\right)\left(1-y\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-1=0\\1-y=0\end{cases}\Rightarrow\orbr{\begin{cases}x=1\\y=1\end{cases}}}\)