\(45cm^{^3}\)

hấp dẫn quá !

Ta có :\(3.\left|5-x\right|=\left|-12\right|\)

\(\Leftrightarrow3.\left|5-x\right|=12\)

\(\Leftrightarrow\left|5-x\right|=\dfrac{12}{3}=4\)

\(\Rightarrow\left[{}\begin{matrix}5-x=4\\5-x=-4\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=1\\x=9\end{matrix}\right.\)

Vậy x=1 hoặc x=9

cảm ơn