\(\Leftrightarrow2x^2-11x+5-2x^2+10x=25\Leftrightarrow-x=20\Leftrightarrow x=-20\)

⇔5-x=0;6+6x=0;2x-4=0

TH₁: 5-x=0           TH₂:6+6x=0              TH₃:2x-4=0

   ⇔x=5                ⇔x=-1                        ⇔x=2

       Vậy x∈{5;-1;2}

\(a,\Leftrightarrow\left(x+2\right)\left(x+2-x+3\right)=0\\ \Leftrightarrow5\left(x+2\right)=0\Leftrightarrow x=-2\\ b,\Leftrightarrow2x\left(x-1\right)^2=0\Leftrightarrow\left[{}\begin{matrix}x=0\\x=1\end{matrix}\right.\\ c,\Leftrightarrow\left(x-1-2x-1\right)\left(x-1+2x+1\right)=0\\ \Leftrightarrow3x\left(-x-2\right)=0\Leftrightarrow-3x\left(x+2\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=0\\x=-2\end{matrix}\right.\)

\(\Leftrightarrow\left(x-2021\right)\left(x-5\right)-\left(x-2021\right)=0\\ \Leftrightarrow\left(x-2021\right)\left(x-6\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=2021\\x=6\end{matrix}\right.\)

`(4x+2)^2+(1-5x)^2-4(2x+1)(1-5x)=0`

`=> (4x+2)^2-4(2x+1)(1-5x)+(1-5x)^2=0`

`=> (4x+2-1+5x)^2=0`

`=> (9x+1)^2=0`

`=> 9x+1=0`

`=> 9x=-1`

`=> x= -1/9`

Vậy \(S=\left\{-\dfrac{1}{9}\right\}\)

Điều kiện:

\(\Delta=\left(m^2+1\right)^2-4\left(m^2-7m+12\right)>0\)

\(\Leftrightarrow m^4+2m^2+1-4m^2-28m+48>0\)

\(\Leftrightarrow m^4-2m^2-28m+49>0\)

rồi giải ra m nhá 

\(\left(2x+m\right)\left(x-1\right)-2x^2+mx+m-2=0\)

\(\Leftrightarrow2x^2-2x+mx-m-2x^2+mx+m-2=0\)

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

\(\Leftrightarrow\left(2m-2\right)x=2\)

\(\Leftrightarrow x=\dfrac{2}{2m-2}\)

Để phương trình đã cho có nghiệm âm thì:

\(\dfrac{2}{2m-2}< 0\)

\(\Leftrightarrow2m-2< 0\)

\(\Leftrightarrow2m< 2\)

\(\Leftrightarrow m< 1\)

Vậy \(m< 1\) thì phương trình đã cho có nghiệm âm.

\(\left(2x+m\right)\left(x-1\right)-2x^2+mx+m-2=0\)

\(\Leftrightarrow2x^2+mx-2x-m-2x^2+mx+m-2=0\)

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

+) Nếu \(m=1\)\(\rightarrow\left(1\right)\Leftrightarrow0x-2=0\left(V_{n_o}\right)\)

+) Nếu \(m\ne1\rightarrow x=\dfrac{2}{2m-2}\)

Để \(x< 0\Leftrightarrow\dfrac{2}{2m-2}< 0\) mà \(2>0\Leftrightarrow2m-2< 0\Leftrightarrow m< 1\)

a: Ta có: \(\left(x-\dfrac{2}{5}\right)\left(x+\dfrac{2}{7}\right)>0\)

\(\Leftrightarrow\left[{}\begin{matrix}x>\dfrac{2}{5}\\x< -\dfrac{2}{7}\end{matrix}\right.\)