tim x biet

T

thienbinhgirl

$\frac{x-1}{x+2}=\frac{x-2}{x+3}$

$\rightarrow (x-2)(x+2)=(x-1)(x+3)$

$\rightarrow x^2-4=x^2+2x-3$

$\rightarrow -2x=1 \rightarrow x=\frac{1}{2}$

 
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