1.Cho biểu thức f(x)=(x2-4)(-x2+3x-2).Ta có:
\(A.f\left(x\right)>0\Leftrightarrow\orbr{\begin{cases}x< -2\\x>2\end{cases}}\)
\(B.f\left(x\right)< 0\Leftrightarrow\orbr{\begin{cases}x< -2\\x>1\end{cases}}\)
\(C.f\left(x\right)>0\Leftrightarrow1< x< 2\)
\(D.f\left(x\right)< 0\Leftrightarrow-2< x< 2\)