a, \(\left|4x-8\right|\le8\)

\(\Leftrightarrow\left(\left|4x-8\right|\right)^2\le64\)

\(\Leftrightarrow16x^2-64x+64\le64\)

\(\Leftrightarrow16x^2-64x\le0\)

\(\Leftrightarrow16x\left(x-4\right)\le0\)

\(\Leftrightarrow0\le x\le4\)

b, \(\left|x-5\right|\le4\)

\(\Leftrightarrow\left(\left|x-5\right|\right)^2\le16\)

\(\Leftrightarrow x^2-10x+25\le16\)

\(\Leftrightarrow x^2-10x+9\le0\)

\(\Leftrightarrow1\le x\le9\)

\(\Rightarrow x\in\left\{1;2;3;4;5;6;7;8;9\right\}\)

c, \(\left|2x+1\right|< 3x\)

TH1: \(x\ge-\dfrac{1}{2}\)

\(\left|2x+1\right|< 3x\)

\(\Leftrightarrow2x+1< 3x\)

\(\Leftrightarrow x>1\)

\(\Rightarrow\left\{{}\begin{matrix}x\in Z\\x\in\left(1;2018\right)\end{matrix}\right.\)

TH2: \(x< -\dfrac{1}{2}\)

\(\left|2x+1\right|< 3x\)

\(\Leftrightarrow-2x-1< 3x\)

\(\Leftrightarrow x>-\dfrac{1}{5}\left(l\right)\)

Vậy \(\left\{{}\begin{matrix}x\in Z\\x\in\left(1;2018\right)\end{matrix}\right.\)

d, \(\left|x+1\right|+\left|x\right|< 3\)

\(\Leftrightarrow x+1+x+2\left|x^2+x\right|< 9\)

\(\Leftrightarrow\left|x^2+x\right|< 4-x\)

Xét hai trường hợp để phá dấu giá trị tuyệt đối

e, Tương tự câu d

`x in [-5,5]`

Áp dụng BĐT `|A|-|B|<=|A-B|`

Dấu "=" `AB>=0,|A|>=|B|`

`|x+3|-|3-2x|<=|x+3-3+2x|=3x`

Dấu "=" `(x+3)(3-2x)>=0`

`<=>(x+3)(2x-3)<=0`

`<=>(x+3)(x-2/3)<=0`

`<=>-3<=x<=2/3(1)`

Và `|x+3|>=|3-2x|`

`<=>(x+3)^2>=(3-2x)^2`

`<=>3x(-x+6)>=0`

`<=>x(x-6)<=0`

`<=>0<=x<=6(2)`

`(1)(2)=>0<=x<=2/3`

Mà `x in [-5,5],x in Z`

`=>x=0`

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

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.

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

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

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

$g'(x)\geq 0$

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

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

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

ĐKXĐ: \(-x^2+4x+m>0\)

\(log_2\left(-x^2+4x+m\right)-log_2\left(x^2+2\right)< log_23\)

\(\Leftrightarrow log_2\left(\dfrac{-x^2+4x+m}{x^2+2}\right)< log_23\)

\(\Leftrightarrow\dfrac{-x^2+4x+m}{x^2+2}< 3\)

\(\Leftrightarrow\left\{{}\begin{matrix}-x^2+4x+m>0\\-x^2+4x+m< 3x^2+6\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}m>x^2-4x\\m< 4x^2-4x+6\end{matrix}\right.\) ; \(\forall x\in\left[1;5\right]\)

Xét hai hàm \(\left\{{}\begin{matrix}f\left(x\right)=x^2-4x\\g\left(x\right)=4x^2-4x+6\end{matrix}\right.\) trên \(\left[1;5\right]\) ta được: \(\left\{{}\begin{matrix}f\left(x\right)_{max}=f\left(5\right)=5\\g\left(x\right)_{min}=g\left(1\right)=6\end{matrix}\right.\)

\(\Rightarrow5\le m\le6\)

Có 2 giá trị nguyên của m

1. \(\left|\frac{2x^2-x}{3x-4}\right|\ge1\) Điều kiện: \(x\ne\frac{4}{3}\)

\(\Leftrightarrow\orbr{\begin{cases}\frac{2x^2-x}{3x-4}\ge1\\\frac{2x^2-x}{3x-4}\le-1\end{cases}}\Leftrightarrow\orbr{\begin{cases}\frac{x^2-2x+2}{3x-4}\ge0\\\frac{x^2+x-2}{3x-4}\le0\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x>\frac{4}{3}\\x\in(-\infty;-2]U[1;\frac{4}{3})\end{cases}}\Leftrightarrow x\in(-\infty;-2]U[1;+\infty)\backslash\left\{\frac{4}{3}\right\}\)

2.\(\hept{\begin{cases}x^2\le-2x+3\left(1\right)\\\left(m+1\right)x\ge2m-1\left(2\right)\end{cases}}\)

\(\left(1\right)\Leftrightarrow x^2+2x-3\le0\Leftrightarrow-3\le x\le1\)

+) Nếu \(m=-1\) thì (2) vô nghiệm, suy ra \(m\ne-1\)

+) Nếu \(m>-1\) thì \(\left(2\right)\Leftrightarrow x\ge\frac{2m-1}{m+1}\)

Hệ BPT có nghiệm duy nhất \(\Leftrightarrow\frac{2m-1}{m+1}=1\Leftrightarrow m=2>-1\)

+) Nếu \(m< -1\)thì \(\left(2\right)\Leftrightarrow x\le\frac{2m-1}{m+1}\)

Hệ BPT có nghiệm duy nhất \(\Leftrightarrow\frac{2m-1}{m+1}=-3\Leftrightarrow m=-\frac{2}{5}< -1\)

Vậy \(m=\left\{\frac{-2}{5};2\right\}\)

1. |2x2−x3x−4 |≥1 Điều kiện: x≠43 

⇔[

⇔[

⇔[

⇔x∈(−∞;−2]U[1;+∞)\{43 }

2.{

(1)⇔x2+2x−3≤0⇔−3≤x≤1

∣∣∣∣∣​3x−42x2−x​∣∣∣∣∣​≥1⇔⎣⎢⎢⎢⎡​​3x−42x2−x​≥13x−42x2−x​≤−1​⇔⎣⎢⎢⎢⎡​​3x−42x2−4x+4​≥03x−42x2+2x−4​≤0​⇔⎣⎢⎢⎡​​3x−4>03x−42x2+2x−4​≤0​

\Leftrightarrow \left[\begin{aligned}&{x>\dfrac{4}{3} } \\ &{1\le x<\dfrac{4}{3} } \\ &{x\le -2} \end{aligned}\right.⇔⎣⎢⎢⎢⎢⎢⎡​​x>34​1≤x<34​x≤−2​ .

Tập nghiệm :S=\left(-\infty ;-2\right]\cup \left[1;\dfrac{4}{3} \right)\cup \left(\dfrac{4}{3} ;+\infty \right)S=(−∞;−2]∪[1;34​)∪(34​;+∞).

2.

Ta có: \left\{\begin{aligned}&{x^{2} \le -2x+3} \\ &{\left(m+1\right)x\ge 2m-1} \end{aligned}\right. \Leftrightarrow \left\{\begin{aligned}&{x^{2} +2x-3\le 0} \\ &{\left(m+1\right)x\ge 2m-1} \end{aligned}\right. \Leftrightarrow \left\{\begin{aligned}&{-3\le x\le 1} \\ &{\left(m+1\right)x\ge 2m-1} \end{aligned}\right.{​x2≤−2x+3(m+1)x≥2m−1​⇔{​x2+2x−3≤0

1: \(\Leftrightarrow\left[{}\begin{matrix}2x-3>5\\2x-3< -5\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x>5\\x< -1\end{matrix}\right.\)

2: \(\Leftrightarrow-4< =2x-1< =4\)

\(\Leftrightarrow\left\{{}\begin{matrix}2x-1>=-4\\2x-1< =4\end{matrix}\right.\Leftrightarrow\dfrac{-3}{2}< =x< =\dfrac{5}{2}\)

4: =>2x-3>5 hoặc 2x-3<-5

=>x>4 hoặc x<-1

5: =>-4<=2x-1<=4

=>-3/2<=x<=5/2