a, đk : x khác -1 ; 1 ; -2
\(\Rightarrow x^2+3x+2+x^2+x-2=2\left(x^2-1\right)\)
\(\Leftrightarrow4x=-2\Leftrightarrow x=-\dfrac{1}{2}\left(tm\right)\)
b, đk x khác -2 ; 2
\(\Rightarrow x^2+3x+2-5x+10=12+x^2-4\)
\(\Leftrightarrow-2x+12=8\Leftrightarrow-2x=-4\Leftrightarrow x=2\left(ktm\right)\)
pt vô nghiệm