d) \(PT\Leftrightarrow x\left(2x-7\right)-4\left(x-7\right)=0\)

\(\Leftrightarrow\left(2x-7\right)\left(x-4\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}2x-7=0\\x-4=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{7}{2}\\x=4\end{matrix}\right.\)

Vậy: \(S=\left\{\dfrac{7}{2};4\right\}\)

e) \(PT\Leftrightarrow\left(2x-5-x-2\right)\left(2x-5+x+2\right)=0\)

\(\Leftrightarrow\left(x-7\right)\left(3x-3\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x-7=0\\3x-3=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=7\\x=1\end{matrix}\right.\)

Vậy: \(S=\left\{7;1\right\}\)

f) \(PT\Leftrightarrow x\left(x-1\right)-3\left(x-1\right)=0\)

\(\Leftrightarrow\left(x-1\right)\left(x-3\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x-1=0\\x-3=0\end{matrix}\right.\)

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

Vậy: \(S=\left\{1;3\right\}\)

\(d,x\left(2x-7\right)-4x+14=0\)

\(x\left(2x-7\right)-2\left(2x-7\right)=0\)

\(\left(x-2\right)\left(2x-7\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=2\\x=\dfrac{7}{2}\end{matrix}\right.\)

d: =>(2x-7)(x-2)=0

=>x=7/2 hoặc x=2

e: =>(2x-5-x-2)(2x-5+x+2)=0

=>(x-7)(3x-3)=0

=>x=7 hoặc x=1

f: =>x(x-1)-3(x-1)=0

=>(x-1)(x-3)=0

=>x=1 hoặc x=3

= [ x ( x + 10 ) ] [ ( x+4 ) ( x+ 6) +128

=( x² + 10x ) ( x² +10x + 24 ) +128

dat : x² + 10x =a , ta co:

a ( a + 24 ) +128

=a²  + 24a +128

= (a + 12 )²  - 16

= ( a+ 12 -4 )  ( a + 12 + 4)

= ( a +8 ) ( a + 16 )

= ( x² + 10x +8 )( x² + 10x + 4)

a: =(x-3)(2x+5)

b: \(\Leftrightarrow\left(x-2\right)\left(x+2+3-2x\right)=0\)

=>(x-2)(5-x)=0

=>x=2 hoặc x=5

c: =>x-1=0

hay x=1

TK

c)=\(\left(x-1\right)^3=0\)=>x=1

3x^3-3x^2-3x=1

4x^3=(x+1)^3

x=1/(căn 3 của 4) -1

\(\Sigma\) các hệ số =0                         ta có 1 nghiệm là x=1

\(\Sigma\) hệ số chẵn =\(\Sigma\) hệ số lẻ        ta có 1 nghiệm là x= -1

vd \(4x^5-4x^4-21x^3+19x^2+20x-12=0\)

ta có 

tổng hệ số chẳn là : \(-4+19-12=3\)

tổng hệ số lẻ là :\(4-21+20=3\)

 vậy pt trên có 1 nghiệm là -1 từ đó bạn dùng hoocno đẻ phân tích nha 

\(\Sigma\) 

x^8+x+1= (x^8 - x^5) + (x^5 - x^2) + (x^2+x+1)

= x^5.(x^3-1) + x^2.(x^3-1) + (x^2+x+1)

= x^5.(x-1).(x^2+x+1) + x^2.(x-1).(x^2+x+1) + (x^2+x+1)

=(x^2+x+1).[x^5.(x-1)+x^2.(x-1)+1]

Ta có: \(A=2\left(x+y\right)^4-3\left(x+y\right)^2-5\)

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

\(=\left(x+y\right)^2\left[2\left(x+y\right)^2-5\right]+\left[2\left(x+y\right)^2-5\right]\)

\(=\left[2\left(x+y\right)^2-5\right]\left[\left(x+y\right)^2+1\right]\)

\(x^6-x^4+2x^3+2x^2\)

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

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

\(=\left(x+1\right).\left(x^5-x^4+2x^2\right)\)

x²(x+1)(x³-X²-1)