bài 1.suy ra (x-7)(x+3) là số âm

suy ra x-7 và x+3 là 2 số trái dấu

mà x+3>x-7

suy ra: x+3 >0 suy ra x> -3

            x-7<7 suy ra x<7

suy ra x thuộc {-2;-1;0;1;2;3;4;5;6}

\(x\in\left\{0;4;-4\right\}\)

a, \(\left(x-1\right).\left(x+2\right)=0\\ \Rightarrow\left[{}\begin{matrix}x-1=0\\x+2=0\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=1\\x=-2\end{matrix}\right.\)

b, \(\left(2x-4\right).\left(3x+9\right)=0\\ \Rightarrow\left[{}\begin{matrix}2x-4=0\\3x+9=0\end{matrix}\right.\left[{}\begin{matrix}2x=4\\3x=-9\end{matrix}\right.\left[{}\begin{matrix}x=2\\x=-3\end{matrix}\right.\)

a) TH₁: x-1=0 => x=1

     TH₂: x+2=0 => x=-2

b) TH₁: 2x-4=0 <=> 2x= 4 <=> x=2

     TH₂: 3x+9=0 <=> 3x=-9 <=> x= -3

a) ( x - 1) . ( x + 2 ) = 0 

=> x - 1 = 0 => x = 1

     x + 2 = 0     x = -2 

vậy x ϵ { 1; -2 }

b) ( 2x - 4 ) . ( 3x + 9 ) = 0

=> 2x - 4  = 0   => 2x = 4  => x = 2

     3x + 9 = 0        3x = -9      x = -3

vậy x ϵ { 2 ; -3 {

P/S : phần mình suy ra thì bn đóng ngoặc vuông to rồi mới ghi phép tính nhé!

a) Để(x^2-1).(2x-6)=0 thì 2x-6=0 suy ra x=3 và x^2-1=0 suy ra x=-1 hoặc 1

b)4x-24=16

4.(x-6)=16

x-6=16:4=4

x=4+6=10

c) Để (x^2+1).(x-5).(x-1)=0 thì:

x-1=0 suy ra x=1

x-5=0 suy ra x=5

x^2+1=0 suy ra x^2=-1 suy ra x=1 hoặc x=-1

Vậy với x thuộc {1;5;-1} thì (x^2+1).(x-5).(x-1)=0

a) \(\left(x^2-1\right)\left(2x-6\right)=0\)

\(\Rightarrow\left[\begin{array}{nghiempt}x^2-1=0\\2x-6=0\end{array}\right.\) \(\Rightarrow\left[\begin{array}{nghiempt}x^2=1\\2x=6\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x=1\\x=3\end{array}\right.\)

Vậy \(x\in\left\{1;3\right\}\)

b) \(2x+3x-x-24=16\)

\(\Rightarrow2x+3x-x=16+24\)

\(\Rightarrow4x=40\)

\(\Rightarrow x=40:4=10\)

Vậy x = 10

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

\(\Rightarrow\left[\begin{array}{nghiempt}x^2+1=0\\x-5=0\\x-1=0\end{array}\right.\) \(\Rightarrow\left[\begin{array}{nghiempt}x^2=-1\\x=0+5\\x=0+1\end{array}\right.\)

\(\Rightarrow\left[\begin{array}{nghiempt}x\in\phi\\x=5\\x=1\end{array}\right.\)

Vậy \(x\in\left\{1;5\right\}\)

a) \(\left(x^2-1\right).\left(2x-6\right)=0\)

\(\Rightarrow\left(x^2-1\right).2\left(x-3\right)=0\)

\(\Rightarrow\left(x^2-1\right).\left(x-3\right)=0\)

\(\Rightarrow x^2-1=0\) hoặc \(x-3=0\)

+) \(x^2-1=0\Rightarrow x^2=1\Rightarrow x=1\) hoặc \(x=-1\)

+) \(x-3=0\Rightarrow x=3\)

Vậy \(x\in\left\{1;-1;3\right\}\)

b) \(2x+3x-x-24=14\)

\(\Rightarrow4x=40\)

\(\Rightarrow x=10\)

Vậy x = 10

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

\(\Rightarrow x^2+1=0\) hoặc \(x-5=0\) hoặc \(x-1=0\)

+) \(x^2+1=0\Rightarrow x^2=-1\) ( vô lí )

+) \(x-5=0\Rightarrow x=5\)

+) \(x-1=0\Rightarrow x=1\)

Vậy \(x\in\left\{5;1\right\}\)

Bài 2: 

a: Ta có: \(x\left(2x-1\right)-2x+1=0\)

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

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