Question

Bài 7 ạ 

Answer 1

Do \(x< y< 1\Rightarrow\left\{{}\begin{matrix}x-1< 0\\y-1< 0\end{matrix}\right.\)

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

Thay vào giả thiết:

\(\left(1-x\right)-\left(1-y\right)=50\)

\(\Leftrightarrow1-x-1+y=50\)

\(\Leftrightarrow-\left(x-y\right)=50\)

\(\Leftrightarrow x-y=-50\)

Vậy \(B=-50\)