\(\Leftrightarrow-3x^2+3x^3+2x-2x^2< 0\)
\(\Leftrightarrow3x^3-5x^2+2x< 0\)
\(\Leftrightarrow3x^3-3x^2-2x^2+2x< 0\)
\(\Leftrightarrow3x^2\left(x-1\right)-2x\left(x-1\right)< 0\)
\(\Leftrightarrow\left(x-1\right)\left(3x^2-2x\right)< 0\)
\(\Leftrightarrow\left(x-1\right)x\left(3x-2\right)< 0\)
\(\Leftrightarrow\left[{}\begin{matrix}x-1< 0\\x< 0\\3x-2< 0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x< 1\\x< 0\\3x< 2\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x< 1\\x< 0\\x< \dfrac{2}{3}\end{matrix}\right.\)
hăm bíc cóa đúng hăm :D (me mới lớp 8:Đ)
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