\(a,f'\left(x\right)=3x^2-6x\\ f'\left(x\right)\le0\Leftrightarrow3x^2-6x\le0\\ \Leftrightarrow3x\left(x-2\right)\le0\Leftrightarrow0\le x\le2\)

Lời giải:

a. $f'(x)\leq 0$

$\Leftrightarrow 3x^2-6x\leq 0$

$\Leftrightarrow x(x-2)\leq 0$

$\Leftrightarrow 0\leq x\leq 2$

b.

$f'(x)=x^2-3x+2=0$

$\Leftrightarrow 3x^2-6x=x^2-3x+2=0$

$\Leftrightarrow 3x(x-2)=(x-1)(x-2)=0$

$\Leftrightarrow x-2=0$

$\Leftrightarrow x=2$

c.

$g(x)=f(1-2x)+x^2-x+2022$

$g'(x)=(1-2x)'f(1-2x)'_{1-2x}+2x-1$

$=-2[3(1-2x)^2-6(1-2x)]+2x-1$
$=-24x^2+2x+5$

$g'(x)\geq 0$

$\Leftrightarrow -24x^2+2x+5\geq 0$

$\Leftrightarrow (5-12x)(2x-1)\geq 0$

$\Leftrightarrow \frac{-5}{12}\leq x\leq \frac{1}{2}$

\(\sqrt{2-f\left(x\right)}=f\left(x\right)\Leftrightarrow\left\{{}\begin{matrix}f\left(x\right)\ge0\\f^2\left(x\right)+f\left(x\right)-2=0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}f\left(x\right)=1\\f\left(x\right)=-2< 0\left(loại\right)\end{matrix}\right.\) 

\(\Rightarrow f\left(1\right)=f\left(2\right)=f\left(3\right)=1\)

\(\sqrt{2g\left(x\right)-1}+\sqrt[3]{3g\left(x\right)-2}=2.g\left(x\right)\)

\(VT=1.\sqrt{2g\left(x\right)-1}+1.1\sqrt[3]{3g\left(x\right)-2}\)

\(VT\le\dfrac{1}{2}\left(1+2g\left(x\right)-1\right)+\dfrac{1}{3}\left(1+1+3g\left(x\right)-2\right)\)

\(\Leftrightarrow VT\le2g\left(x\right)\)

Dấu "=" xảy ra khi và chỉ khi \(g\left(x\right)=1\)

\(\Rightarrow g\left(0\right)=g\left(3\right)=g\left(4\right)=g\left(5\right)=1\)

Để các căn thức xác định \(\Rightarrow\left\{{}\begin{matrix}f\left(x\right)-1\ge0\\g\left(x\right)-1\ge0\end{matrix}\right.\)

Ta có:

\(\sqrt{f\left(x\right)-1}+\sqrt{g\left(x\right)-1}+f\left(x\right).g\left(x\right)-f\left(x\right)-g\left(x\right)+1=0\)

\(\Leftrightarrow\sqrt{f\left(x\right)-1}+\sqrt{g\left(x\right)-1}+\left[f\left(x\right)-1\right]\left[g\left(x\right)-1\right]=0\)

\(\Leftrightarrow\left\{{}\begin{matrix}f\left(x\right)=1\\g\left(x\right)=1\end{matrix}\right.\) \(\Leftrightarrow x=3\)

Vậy tập nghiệm của pt đã cho có đúng 1 phần tử

3x² - 12x - |x - 2| > 12

⇔ \(\left[{}\begin{matrix}\left\{{}\begin{matrix}x\ge2\\3x^2-12x-\left(x-2\right)>12\end{matrix}\right.\\\left\{{}\begin{matrix}x< 2\\3x^2-12x-\left(2-x\right)>12\end{matrix}\right.\end{matrix}\right.\)

⇔ \(\left[{}\begin{matrix}\left\{{}\begin{matrix}x\ge2\\3x^2-12x-x+2>12\end{matrix}\right.\\\left\{{}\begin{matrix}x< 2\\3x^2-12x+x-2>12\end{matrix}\right.\end{matrix}\right.\)

⇔ \(\left[{}\begin{matrix}x>5\\x< -1\end{matrix}\right.\)

Vậy tập nghiệm là \(S=\left(-\infty;-1\right)\cup\left(5;+\infty\right)\)

\(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x\ge2\\3\left(x^2-4x\right)-\left(x-2\right)>12\end{matrix}\right.\\\left\{{}\begin{matrix}x< 2\\3\left(x^2-4x\right)-\left(2-x\right)>12\end{matrix}\right.\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}\left\{{}\begin{matrix}x\ge2\\3x^2-13x-10>0\end{matrix}\right.\\\left\{{}\begin{matrix}x< 2\\3x^2-11x-14>0\end{matrix}\right.\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x>5\\x< -1\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}a=-1\\b=5\end{matrix}\right.\)

x=\(\left\{{}\begin{matrix}x=3\\x=-3\\x=-2\end{matrix}\right.\)

\(\Rightarrow\) (-\(\infty\); -3] \(\cup\) { 3 }

a/

\(\Leftrightarrow\frac{\left(x^2-1\right)\left(x^2+1\right)}{x^2+3x}+x^2-1\ge0\)

\(\Leftrightarrow\left(x^2-1\right)\left(\frac{x^2+1}{x^2+3x}+1\right)\ge0\)

\(\Leftrightarrow\left(x^2-1\right)\left(\frac{2x^2+3x+1}{x^2+3x}\right)\ge0\)

\(\Leftrightarrow\frac{\left(x-1\right)\left(x+1\right)\left(x+1\right)\left(2x+1\right)}{x\left(x+3\right)}\ge0\)

\(\Leftrightarrow\frac{\left(x-1\right)\left(2x+1\right)\left(x+1\right)^2}{x\left(x+3\right)}\ge0\)

\(\Rightarrow\left[{}\begin{matrix}x< -3\\x=-1\\-\frac{1}{2}\le x< 0\\x\ge1\end{matrix}\right.\)

b/

\(\Leftrightarrow\left(x^2-1\right)\left(x^2-4\right)\left(\frac{-2-2x}{x}\right)\le0\)

\(\Leftrightarrow\frac{-2.\left(x-1\right)\left(x+1\right)\left(x-2\right)\left(x+2\right)\left(x+1\right)}{x}\le0\)

\(\Leftrightarrow\frac{\left(x+2\right)\left(x-1\right)\left(x-2\right)\left(x+1\right)^2}{x}\ge0\)

\(\Rightarrow\left[{}\begin{matrix}x\le-2\\x=-1\\0< x\le1\\x\ge2\end{matrix}\right.\)

c/

\(\Leftrightarrow\left(\frac{4\left(x-1\right)-2x}{x\left(x-1\right)}\right)\left(\frac{x^2+1-2x}{x}\right)\le0\)

\(\Leftrightarrow\frac{\left(2x-4\right)\left(x-1\right)^2}{x^2\left(x-1\right)}\le0\)

\(\Leftrightarrow\frac{\left(x-2\right)\left(x-1\right)^2}{x^2\left(x-1\right)}\le0\)

\(\Rightarrow1< x\le2\)

d/

ĐKXĐ: \(\left\{{}\begin{matrix}x^3-4x\ge0\\\frac{1+x}{x}-2\ge0\\x\ne0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x\left(x-2\right)\left(x+2\right)\ge0\\\frac{1-x}{x}\ge0\\x\ne0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}\left[{}\begin{matrix}-2\le x\le0\\x\ge2\end{matrix}\right.\\0< x\le1\\x\ne0\end{matrix}\right.\)

\(\Rightarrow\) Không tồn tại x thỏa mãn ĐKXĐ

Vậy BPT đã cho vô nghiệm

a) \(x^3-4x^2-5x+6=\sqrt[3]{7x^2+9x-4}\)

\(\Leftrightarrow-7x^2-9x+4+x^3+3x^2+4x+2=\sqrt[3]{7x^2+9x-4}\)

\(\Leftrightarrow-\left(7x^2+9x-4\right)+\left(x+1\right)^3+x+1=\sqrt[3]{7x^2+9x-4}\) (*)

Đặt \(\sqrt[3]{7x^2+9x-4}=a;x+1=b\)

Khi đó (*) \(\Leftrightarrow-a^3+b^3+b=a\)

\(\Leftrightarrow\left(b-a\right).\left(b^2+ab+a^2+1\right)=0\)

\(\Leftrightarrow b=a\)

Hay \(x+1=\sqrt[3]{7x^2+9x-4}\)

\(\Leftrightarrow\left(x+1\right)^3=7x^2+9x-4\)

\(\Leftrightarrow x^3-4x^2-6x+5=0\)

\(\Leftrightarrow x^3-4x^2-5x-x+5=0\)

\(\Leftrightarrow\left(x-5\right)\left(x^2+x-1\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=5\\x=\dfrac{-1\pm\sqrt{5}}{2}\end{matrix}\right.\)