|x-9|=2x+5

Xét 3 TH

TH1: x>9 => x-9=2x+5 =>-9-5=x =>x=-14 (L)

TH2: x<9 => 9-x=2x+5 => 9-5=3x =>x=4/3(t/m)

TH3: x=9 =>0=23(L)

Vậy  x= 4/3

Ta có:\(\dfrac{1-2x}{4}-2\le\dfrac{1-5x}{8}+x\\ \)

\(\dfrac{2-4x-16}{8}\le\dfrac{1-5x+8x}{8}\)

\(-4x-14\le1+3x\\ \Leftrightarrow7x+15\ge0\\ \Leftrightarrow x\ge-\dfrac{15}{7}\)

Ta có:

\(\dfrac{2}{x-3}+\dfrac{3}{x+3}=\dfrac{3x+5}{x^2-9}\)

\(\dfrac{2\left(x+3\right)+3\left(x-3\right)}{x^2-9}=\dfrac{3x+5}{x^2-9}\)

\(5x-4=3x+5\Leftrightarrow2x=9\Leftrightarrow x=\dfrac{9}{2}\)

câu a bài 1:(2x+1)(3x-2)=(5x-8)(2x+1)

<=>(2x+1)(3x-2)-(5x-8)(2x+1)=0

<=>(2x+1)(3x-2-5x+8)=0

<=>(2x+1)(6-2x)=0

bước sau tự làm nốt nha !

câu b:gợi ý: tách 4x^2-1thành (2x-1)(2x+1) rồi làm như câu a

Bài 2: 

a: \(\dfrac{1}{2x-3}-\dfrac{3}{x\left(2x-3\right)}=\dfrac{5}{x}\)

\(\Leftrightarrow x-3=5\left(2x-3\right)=10x-15\)

=>-9x=-12

hay x=4/3

b: \(\Leftrightarrow x\left(x+2\right)-x+2=2\)

=>x²+2x-x+2=2

=>x²+x=0

=>x=0(loại) hoặc x=-1(nhận)

c: \(\dfrac{x+1}{x-2}+\dfrac{x-1}{x+2}=\dfrac{2\left(x^2+2\right)}{\left(x-2\right)\left(x+2\right)}\)

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

=>4=4(luôn đúng)

Vậy: S={x|x<>2; x<>-2}

bổ sung:tìm điều kiện xác định của phương trình

ĐKXĐ : x khác cộng trừ 2

Lời giải:

PT \(\Leftrightarrow [(x-5)(x-8)][(x-4)(x-10)]=72x^2\)

\(\Leftrightarrow (x^2-13x+40)(x^2-14x+40)=72x^2\)

Đặt \(x^2-13x+40=a\) thì pt trở thành:

\(a(a-x)=72x^2\)

\(\Leftrightarrow a^2-ax-72x^2=0\)

\(\Leftrightarrow a^2-9ax+8ax-72x^2=0\)

\(\Leftrightarrow a(a-9x)+8x(a-9x)=0\)

\(\Leftrightarrow (a-9x)(a+8x)=0\)

Nếu $a-9x=0$

\(\Leftrightarrow x^2-13x+40-9x=0\)

\(\Leftrightarrow x^2-22x+40=0\)

\(\Leftrightarrow (x-2)(x-20)=0\Rightarrow \left[\begin{matrix} x=2\\ x=20\end{matrix}\right.\)

Nếu $a+8x=0$

\(\Leftrightarrow x^2-13x+40+8x=0\)

\(\Leftrightarrow x^2-5x+40=0\Leftrightarrow (x-\frac{5}{2})^2=-\frac{135}{4}\) (vô lý)

Vậy........

\(\Leftrightarrow16-3\left(x+1\right)< 24+2\left(x-1\right)\)

=>16-3x-3<24+2x-2

=>-3x+13<2x+22

=>-5x<9

hay x>-9/5

tìm ra đáp án chưa

Đc rồi chỉ mình với

Bài 3: 

a: \(\Leftrightarrow\left(x+5\right)\left(x-3\right)=\left(x+1\right)\left(x-1\right)-8\)

\(\Leftrightarrow x^2+2x-15=x^2-1-8=x^2-9\)

=>2x=6

hay x=3(loại)

b: \(\Leftrightarrow\dfrac{\left(x+1\right)\left(x^2-x+1\right)-\left(x-1\right)\left(x^2+x+1\right)}{\left(x^2-x+1\right)\left(x^2+x+1\right)}=\dfrac{3}{x\left(x^2+x+1\right)\left(x^2-x+1\right)}\)

\(\Leftrightarrow x\left(x^3+1-x^3+1\right)=3\)

=>2x=3

hay x=3/2

\(\Leftrightarrow x^2+2x+1+\left|x-1\right|=x^2+4\)

\(\Leftrightarrow\left|x-1\right|=3-2x\)

\(\Leftrightarrow\left[{}\begin{matrix}x-1=3-2x\\x-1=2x-3\end{matrix}\right.\)\(\Leftrightarrow\left[{}\begin{matrix}x=\frac{4}{3}\\x=2\end{matrix}\right.\)

Nếu x lớn hơn hoặc bằng 2, có:

|x - 2|(x - 1)(x + 1)(x + 2) = 4

(x - 2)(x + 2)(x - 1)(x + 1) = 4

(x² - 4)(x² - 1) = 4

x⁴ - 4x² + 4 = 4

(x² - 2)² = 4 => x² - 2 = 2 => x² = 4 => x = 2

Nếu x nhỏ hơn 2, có:

|x - 2|(x - 1)(x + 1)(x + 2) = 4

(2 - x)(2 + x)(x - 1)(x + 1) = 4

(4 - x²)(x² - 1) = 4

5x² - x⁴ - 4 = 4

x² - (x⁴ - 4x² + 4) = 4

x² - 4 - (x² - 2)² = 0

(x ​- 2)(x + 2) - (x² - 2)² = 0