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

\(\Leftrightarrow\)\(\left(5x-1\right)\left(5x-1-5x\right)=0\)

\(\Leftrightarrow\)\(\left(5x-1\right).\left(-1\right)=0\)

\(\Leftrightarrow\)\(5x-1=0\)

\(\Leftrightarrow\)\(5x=1\)

\(\Leftrightarrow\)\(x=\frac{1}{5}\)

Vậy \(x=\frac{1}{5}\)

\(b)\) \(x\left(x+1\right)\left(x+2\right)=0\)

Suy ra \(x=0\) hoặc \(x+1=0\) hoặc \(x+2=0\)

\(\Leftrightarrow\)\(x=0\) hoặc \(x=-1\) hoặc \(x=-2\)

Vậy \(x=0\) hoặc \(x=-1\) hoặc \(x=-2\)

\(c)\) \(\left(3x+2\right)x-3\left(3x+2\right)=0\)

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

\(\Leftrightarrow\)\(\orbr{\begin{cases}3x+2=0\\x-3=0\end{cases}\Leftrightarrow\orbr{\begin{cases}3x=0-2\\x=0+3\end{cases}}}\)

\(\Leftrightarrow\)\(\orbr{\begin{cases}3x=-2\\x=3\end{cases}\Leftrightarrow\orbr{\begin{cases}x=\frac{-2}{3}\\x=3\end{cases}}}\)

Vậy \(x=\frac{-2}{3}\) hoặc \(x=3\)

Chúc bạn học tốt ~ 

a/ \(\left(5x-1\right)^2-5x\left(5x-1\right)=0\)

<=> \(\left(5x-1\right)\left(5x-1-5x\right)=0\)

<=> \(-1\left(5x-1\right)=0\)

<=> \(5x-1=0\)

<=> \(5x=1\)

<=> \(x=\frac{1}{5}\)

b/ \(x\left(x+1\right)\left(x+2\right)=0\)

<=> \(x=0\) hoặc \(\orbr{\begin{cases}x+1=0\\x+2=0\end{cases}}\)

<=> \(x=0\)hoặc \(\orbr{\begin{cases}x=-1\\x=-2\end{cases}}\)

c/ \(\left(3x+2\right)x-3\left(3x+2\right)=0\)

<=> \(\left(3x+2\right)\left(x-3\right)=0\)

<=> \(\orbr{\begin{cases}3x+2=0\\x-3=0\end{cases}}\)

<=> \(\orbr{\begin{cases}3x=-2\\x=3\end{cases}}\)

<=> \(\orbr{\begin{cases}x=-\frac{2}{3}\\x=3\end{cases}}\)

a)

\(\Rightarrow x\left(x-5\right)=0\)

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

\(\Rightarrow\left[\begin{array}{nghiempt}x=0\\x=5\end{array}\right.\)

b)

\(\Rightarrow3x\left(x-2\right)-2\left(x-2\right)=0\)

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

\(\Rightarrow\left[\begin{array}{nghiempt}x-2=0\\3x-2=0\end{array}\right.\)\(\Rightarrow\left[\begin{array}{nghiempt}x=2\\x=\frac{2}{3}\end{array}\right.\)

c)

\(\Rightarrow\left(3x-1\right)\left(5x+x-2\right)=0\)

\(\Rightarrow\left(3x-2\right)^2.2=0\)

\(\Rightarrow3x-2=0\)

\(\Rightarrow x=\frac{2}{3}\)

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

\(\left(x^2-4x+4\right)-\left(x^2+6x+9\right)-4x-4=5\)

\(\left(-4x-6x\right)+\left(4-9\right)-4x-4=5\)

\(-10x-5-4x-4=5\)

\(-14x-9=5\)

\(-14x=14\Rightarrow x=-1\)

\(b.\left(2x-3\right)\left(2x+3\right)-\left(x-1\right)^2-3x\left(x-5\right)=-44\)

\(4x^2-9-\left(x^2-2x+1\right)-\left(3x^2-15x\right)=-44\)

\(4x^2-9-x^2+2x-1-3x^2+15x=-44\)

\(17x-10=-44\)

\(17x=-34\Rightarrow x=-2\)

\(c.\left(5x+1\right)^2-\left(5x-3\right)\left(5x+3\right)=30\)

\(25x^2+10x+1-\left(25x^2-9\right)=30\)

\(10x+10=30\)

\(10x=20\Rightarrow x=2\)

\(d.\left(x+3\right)^2+\left(x-2\right)\left(x+2\right)-2\left(x-1\right)^2=7\)

\(\left(x^2+6x+9\right)+\left(x^2-4\right)-2\left(x^2-2x+1\right)=7\)

\(2x^2+6x+5-2x^2+4x-2=7\)

\(10x+3=7\)

\(10x=4\Rightarrow x=\frac{4}{10}=\frac25\)

\(f.\left(3x-8\right)^2=0\)

\(3x-8=0\Rightarrow x=\frac83\)

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

\(6\left(x^2+2x+1\right)-2x-2+2\left(x^3-1\right)=0\)

\(6x^2+12x+6-2x-2+2x^3-2=0\)

\(2x^3+6x^2+10x+2=0\)

\(\Rightarrow x\approx-0,23\)

a, ĐK: \(x\ge\dfrac{1}{5}\)

\(pt\Leftrightarrow\sqrt{5x^2+x+3}+5x-1-2\sqrt{5x-1}+1+x^2+2x+1=-2\)

\(\Leftrightarrow\sqrt{5x^2+x+3}+\left(\sqrt{5x-1}-1\right)^2+\left(x+1\right)^2=-2\)

\(\Rightarrow\) Phương trình vô nghiệm

a) (5x+1)² - (5x-3).(5x+3) = 0

25x² + 10x + 1 - 25x² + 9 = 0

10x + 10 = 0

10.(x+1) = 0

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

b) (x+3).(x² - 3x + 9) - x.(x-2).(x+2) = 0

x³ + 27 - x.(x² - 4) = 0

x³ + 27 - x³ + 4x = 0

27 + 4x = 0

4x = - 27

x = -27/4

c) 3x.(x-2) - x + 2= 0

3x.(x-2) - (x-2) = 0

(x-2).(3x-1) = 0

=> x - 2 =0 => x = 2

3x-1 = 0 => 3x = 1 => x = 1/3

d) x.(2x-3) - 2.(3-2x) = 0

x.(2x-3) + 2.(2x-3) = 0

(2x-3).(x+2) = 0

=> 2x - 3 = 0 => 2x =  3 => x = 3/2

x+ 2 = 0 => x = -2

KL:...\

\(a,\Leftrightarrow x\left(x+5\right)=0\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-5\end{matrix}\right.\\ b,\Leftrightarrow3x\left(x-1\right)+\left(x-1\right)=0\\ \Leftrightarrow\left(x-1\right)\left(3x+1\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=1\\x=-\dfrac{1}{3}\end{matrix}\right.\\ c,\Leftrightarrow\left(x+2\right)\left(2x-3\right)=0\Leftrightarrow\left[{}\begin{matrix}x=-2\\x=\dfrac{3}{2}\end{matrix}\right.\)

a) 3x(4x - 3) - 2x(5 - 6x) = 0

=> 6x² - 9x - 10x + 12x² = 0

=> 18x² - 19x = 0

=> x(18x - 19) = 0

=> \(\orbr{\begin{cases}x=0\\18x-19=0\end{cases}}\)

=> \(\orbr{\begin{cases}x=0\\x=\frac{19}{18}\end{cases}}\)

b) 5(2x - 3) + 4x(x - 2) + 2x(3 - 2x) = 0

=> 10x - 15 + 4x² - 8x + 6x - 4x² = 0

=> 8x - 15 = 0

=> 8x = 15

=> x = 15 : 8 = 15/8

c) 3x(2 - x) + 2x(x - 1) = 5x(x + 3)

=> 6x - 3x² + 2x² - 2x = 5x² + 15x

=> 4x - x² - 5x² - 15x = 0

=> -6x² - 11x = 0

=> -x(6x - 11) = 0

=> \(\orbr{\begin{cases}-x=0\\6x-11=0\end{cases}}\)

=> \(\orbr{\begin{cases}x=0\\x=\frac{11}{6}\end{cases}}\)

a) \(3x\left(4x-3\right)-2x\left(5-6x\right)=0\)

\(\Leftrightarrow12x^2-9x-10x+12x^2=0\)

\(\Leftrightarrow-19x=0\Leftrightarrow x=0\)

b) \(5\left(2x-3\right)+4x\left(x-2\right)+2x\left(3-2x\right)=0\)

\(\Leftrightarrow10x-15+4x^2-8x+6x-4x^2=0\)

\(\Leftrightarrow8x-15=0\Leftrightarrow x=\frac{15}{8}\)

a)x^2-5=0

x^2=5

x=2.236

b) 3x^3-27x=0

=)x=3

C)5x(x-1)-x+1=0

=)x=1

D)2(x+5)-x^2-5×=0

=)x=2