Question

Tìm x

Answer 1

\(\left(0,75-x\right)\left(\dfrac{7}{2}-2x\right)=0\\ \Rightarrow\left[{}\begin{matrix}0,75-x=0\\\dfrac{7}{2}-2x=0\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}\dfrac{3}{4}-x=0\\2x=\dfrac{7}{2}\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=\dfrac{3}{4}-0\\x=\dfrac{7}{2}:2\end{matrix}\right.\\ \Rightarrow\left[{}\begin{matrix}x=\dfrac{3}{4}\\x=\dfrac{7}{4}\end{matrix}\right.\)

Vậy \(x\in\left\{\dfrac{3}{4};\dfrac{7}{4}\right\}\)