\(\Delta'=\left(2m+1\right)^2-\left(4m^2+4m\right)=1>0;\forall m\Rightarrow\) pt luôn có 2 nghiệm pb

Theo hệ thức Viet: \(\left\{{}\begin{matrix}x_1+x_2=2\left(2m+1\right)\\x_1x_2=4m^2+4m\end{matrix}\right.\)

\(\left|x_1-x_2\right|=x_1+x_2\)

\(\Leftrightarrow\left\{{}\begin{matrix}x_1+x_2\ge0\\\left(x_1-x_2\right)^2=\left(x_1+x_2\right)^2\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}2\left(2m+1\right)\ge0\\-2x_1x_2=2x_1x_2\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}m\ge-\dfrac{1}{2}\\x_1x_2=0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}m\ge-\dfrac{1}{2}\\4m^2+4m=0\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}m=0\\mm=-1< -\dfrac{1}{2}\left(loại\right)\end{matrix}\right.\)

áp dụng vi et 
x1+x2=\(\dfrac{-b}{a}=4m+2\)
x1.x2=\(\dfrac{c}{a}=4m^2+4m\)
ta có :
\(|x_1-x_2|=x_1+x_2\)
<->(x1-x2)²=(x1+x2)²
<->(x1+x2)²-4x₁.x₂=(4m+2)²
<->(4m+2)²-4(4m²+4m)=(4m+2)²
<->16m²+4+16m-16m²-16m=16m²+4+16m
<->16m²+16m=0
<->16m(m+1)=0
<->m=0
     m=-1
vậy m =0 và m=-1 thì tm hệ thức trên

Ta có: \(\text{Δ}=\left(1-4m\right)^2-4\left(3-2m\right)\left(1-2m\right)\)

\(=16m^2-8m+4-4\left(2m-3\right)\left(2m-1\right)\)

\(=16m^2-8m+4-4\left(4m^2-2m-6m+3\right)\)

\(=16m^2-8m+4-4\left(4m^2-8m+3\right)\)

\(=16m^2-8m+4-16m^2+32m-12\)

\(=24m-8\)

Để phương trình có hai nghiệm phân biệt thì

\(\left\{{}\begin{matrix}3-2m\ne0\\24m-8>0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}2m\ne3\\24m>8\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}m\ne\dfrac{3}{2}\\m>\dfrac{1}{3}\end{matrix}\right.\)

1:

\(=\left(\dfrac{1}{x-2\sqrt{x}}+\dfrac{2}{3\sqrt{x}-6}\right):\dfrac{2\sqrt{x}+3}{3\sqrt{x}}\)

\(=\dfrac{3+2\sqrt{x}}{3\sqrt{x}\left(\sqrt{x}-2\right)}\cdot\dfrac{3\sqrt{x}}{2\sqrt{x}+3}=\dfrac{1}{\sqrt{x}-2}\)

\(x^3+\left(2m+5\right)x^2+\left(2m+6\right)x-4m-12=\left(x^3-x^2\right)+\left[\left(2m+6\right)x^2-\left(2m+6\right)x\right]+\left[\left(4m+12\right)x-\left(4m+12\right)\right]=\left[x^2+\left(2m+6\right)x+\left(4m+12\right)\right]\left(x-1\right)\)