Question

Tìm x,y,z

Answer 1

\(\left|2\dfrac{1}{4}-x\right|=4\)

\(\Leftrightarrow\left[{}\begin{matrix}x-\dfrac{9}{4}=4\\x-\dfrac{9}{4}=-4\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{25}{4}\\x=-\dfrac{7}{4}\end{matrix}\right.\)

Answer 2

|9/4-x| = 4

Th1:

9/4-x=4

x= -(7/4)

Th2:

9/4-x=-4

x= 9/4+4

x= 25/4