X-1/x+2=x-2/x+3
=>(x-1)(x+3)=(x+2)(x-2)
=>x(x+3)-1(x+3)=x(x-2)+2(x-2)
=>x^2+3x-x-3=x^2-2x+2x-4
=>x^2+2x-3=x^2-4
=>2x-3=-4=>x=-1/2=-0,5
vậy...
\(\frac{x-1}{x+2}=\frac{x-2}{x+3}\Leftrightarrow\left(x-1\right)\left(x+3\right)=\left(x-2\right)\left(x+2\right)\)
\(\Leftrightarrow x^2-x+3x-3=x^2-2x+2x-4\)
\(\Leftrightarrow x^2+2x-3=x^2-4\)
\(\Leftrightarrow x^2-x^2+2x=3-4\)
\(\Leftrightarrow2x=-1\Leftrightarrow x=-\frac{1}{2}\)