A = $\frac{x+2}{x+3}$ > 1 (dkxd x khác -3)
<=> $\frac{x+2}{x+3}$ > $\frac{x+3}{x+3}$
<=> $\frac{x+2}{x+3}$ - $\frac{x+3}{x+3}$ > 0
<=>$\frac{-1}{x+3}$ > 0
<=> x+ 3 < 0
<=> x< -3 (kết hợp đkxd)
B = $\frac{x-1}{x+2}$ < 1 (dkxd x khác -2)
<=> $\frac{x-1}{x+2}$ < $\frac{x+2}{x+2}$
<=> $\frac{-3}{x+2}$ <0
<=> x+ 2 > 0
<=> x> -2 ( kết hợp đkxd)