đkxđ:xx>3 

\(\left|5-2x\right|=x-4\) 

=>TH1:

\(5-2x=x-4\)

-x-2x=-5-4

-3x=-9

x=3(loại)

TH2:

5-2x=-x+4

x-2x=-5+4

-x=-1

x=1(loại)

vậy ko tìm đc x thỏa mãn đề bài

\(\left|5-2x\right|-3=x-7\)

\(\left|5-2x\right|=x-7+3\)

\(\left|5-2x\right|=x-4\)

Đk: \(x-4\ge0\)\(\Rightarrow x\ge4\)

Ta có: \(\left|5-2x\right|=x-4\)

\(\Rightarrow\orbr{\begin{cases}5-2x=x-4\\5-2x=-x+4\end{cases}\Rightarrow}\orbr{\begin{cases}-2x-x=-4-5\\-2x+x=4-5\end{cases}\Rightarrow}\orbr{\begin{cases}3x=9\\-x=1\end{cases}\Rightarrow}\orbr{\begin{cases}x=3\\x=-1\end{cases}}\)( cả 2 trường hợp x ko thỏa mãn )

Vậy \(x\in\varnothing\)

Nhầm :(

-2x + x = 4 - 5

<=> -x = -1

<=> x = 1 ( ko thỏa mãn )

Lời giải:

a. $9x^2-16-(3x-4)(2x+5)=0$

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

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

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

$\Leftrightarrow (3x-4)(x-1)=0$

$\Leftrightarrow 3x-4=0$ hoặc $x-1=0$

$\Leftrightarrow x=\frac{4}{3}$ hoặc $x=1$.

b.

$x^2+4x=12$

$\Leftrightarrow x^2+4x-12=0$

$\Leftrightarrow (x^2-2x)+(6x-12)=0$

$\Leftrightarrow x(x-2)+6(x-2)=0$

$\Leftrightarrow (x-2)(x+6)=0$

$\Leftrightarrow x-2=0$ hoặc $x+6=0$

$\Leftrightarrow x=2$ hoặc $x=-6$

c.

$x^2-2x=35$

$\Leftrightarrow x^2-2x-35=0$

$\Leftrightarrow (x^2+5x)-(7x+35)=0$

$\Leftrightarrow x(x+5)-7(x+5)=0$

$\Leftrightarrow (x+5)(x-7)=0$

$\Leftrightarrow x+5=0$ hoặc $x-7=0$

$\Leftrightarrow x=-5$ hoặc $x=7$

$(2x+\dfrac 3 5)^2-\dfrac{24}{25}=1\\\Leftrightarrow (2x+\dfrac{3}{5})^2=\dfrac{49}{25}\\\Leftrightarrow \left[\begin{array}{1}2x+\dfrac{3}{5}=\dfrac{7}{5}\\2x+\dfrac{3}{5}=-\dfrac{7}{5}\end{array}\right.\\\Leftrightarrow \left[\begin{array}{1}2x=\dfrac{4}{5}\\2x=-2\end{array}\right.\\\Leftrightarrow \left[\begin{array}{1}x=\dfrac{2}{5}\\x=-1\end{array}\right.$

Vậy $x=\dfrac{2}{5},x=-1$

GIải

\(\left(2x+\dfrac{3}{5}\right)^2-\dfrac{24}{25}=1\)

\(\left(2x+\dfrac{3}{5}\right)^2\)           \(=1+\dfrac{24}{25}\)

\(\left(2x+\dfrac{3}{5}\right)^2\)           \(=\dfrac{49}{25}\)

\(4x+\dfrac{9}{25}\)                 \(=\dfrac{49}{25}\)

\(4x\)                           \(=\dfrac{49}{25}-\dfrac{9}{25}\)

\(4x\)                           \(=\dfrac{8}{5}\)

 \(x\)                            \(=4:\dfrac{8}{5}\)

 \(x\)                            \(=\dfrac{5}{2}\)

<=> 2x + 12 = 3x - 21

<=> 2x - 3x  = -21 - 12

<=>    -x       = -33

<=>      x       = 33

a) \(A=\left(2x-1\right)\left(x+3\right)-\left(x-2\right)\left(3x-4\right)+5x\)

\(=\left(2x^2+6x-x-3\right)-\left(3x^2-4x-6x+8\right)+5x\)

\(=\left(2x^2+5x-3\right)-\left(3x^2-10x+8\right)+5x\)

\(=2x^2+5x-3-3x^2+10x-8+5x\)

\(=x^2+20x-11\)

b) \(5x\left(2x^2-3x+1\right)-2x\left(x+1\right)\left(x-2\right)\)

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

\(=10x^3-15x^2+5x-2x^3+4x^2-2x^2+4x\)

\(=8x^3-13x^2+9x\)

c) \(\left(3x+2\right)\left(x+1\right)-2x\left(x+3\right)-2x+1\)

\(=3x^2+3x+2x+2-2x^2-6x-2x+1\)

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

\(C=\left(3x+2\right)\left(x-1\right)-2x\left(x+3\right)-2x+1\\ C=3x^2-x-2-2x^2-6x-2x+1\\ C=x^2-9x-1\)

\(\left(2x-5\right)^2+4\left(3+x\right)\left(x-3\right)-2x=-5\)

\(\Leftrightarrow4x^2-20x+25+4x^2-36-2x=-5\)

\(\Leftrightarrow8x^2-22x-11=-5\Leftrightarrow8x^2-22x-6=0\)

\(\Leftrightarrow2\left(4x^2-11x-3\right)=0\Leftrightarrow2\left[\left(4x^2-12x\right)+\left(x-3\right)\right]=2\left[4x\left(x-3\right)+\left(x-3\right)\right]=0\)

\(\Leftrightarrow2\left(x-3\right)\left(4x+1\right)=0\)

*) x - 3 = 0  <=> x = 3

*) 4x + 1 = 0  <=> x = -1/4

a) (12x-5)(4x-1)+(3x-7)(1-16x)

= (48x^2 - 12x - 20x + 5) + (3x - 48x^2 - 7 + 112x)

= 48x^2 - 12x - 20x + 5 +3x - 48x^2 -7 + 112x

= 83x-2

những phần sau bạn cứ làm tương tự theo cách nhân đa thức với đa thức và phá ngiawcj là ra nha :0))

sao ko làm hết ra

\(-2\left(2x-8\right)+3\left(4-2x\right)=-72-5\left(3x-7\right)\)

\(-4x+16+12-6x=-72-15x+35\)

\(-4x-6x+15x+28=-72+35\)

\(5x+28=-37\)

\(5x=-65\)

\(x=-13\)

Vậy \(x=-13.\)

        -2(2x-8) + 3(4-2x) = -72 - 5(3x - 7)

\(\Leftrightarrow\)-4x +16 +12 - 6x = -72 - 15x + 35

\(\Leftrightarrow\)-4x - 6x +15x = 35 - 72 - 16 - 12

\(\Leftrightarrow\)5x = -65

\(\Leftrightarrow\)x=-13

k cho mk nha :)