\(\left(x+\frac{5}{3}\right)\left(x-\frac{5}{4}\right)=0\\ \Rightarrow\left[{}\begin{matrix}x+\frac{5}{3}=0\\x-\frac{5}{4}=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-\frac{5}{3}\\x=\frac{5}{4}\end{matrix}\right.\)
VẬy...
<x-5/4>=0hoạc <x+5/3>=0 x=5/4 hoạc x=-5/3
để (x+5/3)(x-5/4)=0
thì: TH (1) x+5/3 =0 => x = -5/3
TH (2) x-5/4 =0 => x = 5/4
Vậy x=-5/3 hoặc x=5/4.