Lời giải:

ĐKXĐ:............

PT \(\Leftrightarrow 2x^2+14x-2x\sqrt{x^2+8x}+8x-14\sqrt{x^2+8x}+24=0\)

\(\Leftrightarrow (x^2+8x)+(x^2+14x+49)-2(x+7)\sqrt{x^2+8x}-25=0\)

\(\Leftrightarrow (x^2+8x)+(x+7)^2-2(x+7)\sqrt{x^2+8x}-25=0\)

\(\Leftrightarrow (\sqrt{x^2+8x}-x-7)^2-25=0\)

\(\Leftrightarrow (\sqrt{x^2+8x}-x-12)(\sqrt{x^2+8x}-x-2)=0\)

Nếu \(\sqrt{x^2+8x}-x-12=0\)

\(\Leftrightarrow \sqrt{x^2+8x}=x+12\Rightarrow \left\{\begin{matrix} x+12\geq 0\\ x^2+8x=(x+12)^2\end{matrix}\right.\)

\(\Rightarrow x=-9\) (thỏa mãn)

Nếu \(\sqrt{x^2+8x}-x-2=0\Leftrightarrow \sqrt{x^2+8x}=x+2\Rightarrow \left\{\begin{matrix} x+2\geq 0\\ x^2+8x=(x+2)^2\end{matrix}\right.\Rightarrow x=1\) (thỏa mãn)

Vậy.........

cai nay la hag dag thuc phan tih ra la dk

pt<=>căn((x-1/2)^2+75/4)+căn(2(x-1/2)^2+3(x+2)^2)+căn((x-1/2)^2+3(2x+3/2)^2)>=3*căn3(x+2)

dấu = xãy ra khi x=1/2

\(\sqrt{x^2-3x+2}-\sqrt{x+3}=\sqrt{x-2}+\sqrt{x^2+2x-3}\)

\(\Leftrightarrow\left(\sqrt{x^2-3x+2}-\sqrt{x-2}\right)-\left(\sqrt{x^2+2x-3}+\sqrt{x+3}\right)=0\)

\(\Leftrightarrow\dfrac{\left(x^2-3x+2\right)-\left(x-2\right)}{\sqrt{x^2-3x+2}+\sqrt{x-2}}-\dfrac{\left(x^2+2x-3\right)-\left(x+3\right)}{\sqrt{x^2+2x-3}-\sqrt{x+3}}=0\)

\(\Leftrightarrow\dfrac{\left(x-2\right)^2}{\sqrt{\left(x-2\right)\left(x-1\right)}+\sqrt{x-2}}-\dfrac{\left(x-2\right)\left(x+3\right)}{\sqrt{\left(x+3\right)\left(x-1\right)}-\sqrt{x+3}}=0\)

\(\Leftrightarrow\left(x-2\right)\left[\dfrac{x-2}{\sqrt{x-2}\left(\sqrt{x-1}+1\right)}-\dfrac{x+3}{\sqrt{x+3}\left(\sqrt{x-1}-1\right)}\right]=0\)

\(\Leftrightarrow\left(x-2\right)\left[\dfrac{\sqrt{x-2}}{\sqrt{x-1}+1}-\dfrac{\sqrt{x+3}}{\sqrt{x-1}-1}\right]=0\)

Pt \(\dfrac{\sqrt{x-2}}{\sqrt{x-1}+1}-\dfrac{\sqrt{x+3}}{\sqrt{x-1}-1}=0\) vô n_o

(vì \(\dfrac{\sqrt{x-2}}{\sqrt{x-1}+1}< \dfrac{\sqrt{x+3}}{\sqrt{x-1}-1}\forall x\ge2\Rightarrow VT< 0\))

=> x - 2 = 0

<=> x = 2 (nhận)

\(\sqrt{4x+1}-\sqrt{3x-2}=\dfrac{x+3}{5}\)

\(\Leftrightarrow\dfrac{\left(4x+1\right)-\left(3x-2\right)}{\sqrt{4x+1}+\sqrt{3x-2}}-\dfrac{x+3}{5}=0\)

\(\Leftrightarrow\dfrac{x+3}{\sqrt{4x+1}+\sqrt{3x-2}}-\dfrac{x+3}{5}=0\)

\(\Leftrightarrow\left(\dfrac{1}{\sqrt{4x+1}+\sqrt{3x-2}}-\dfrac{1}{5}\right)\left(x+3\right)=0\)

TH1:

x + 3 = 0

<=> x = - 3 (loại)

TH2:

\(\dfrac{1}{\sqrt{4x+1}+\sqrt{3x-2}}-\dfrac{1}{5}=0\)

\(\Leftrightarrow\sqrt{4x+1}+\sqrt{3x-2}=5\)

\(\Leftrightarrow\left(\sqrt{4x+1}-3\right)+\left(\sqrt{3x-2}-2\right)=0\)

\(\Leftrightarrow\dfrac{4x+1-9}{\sqrt{4x+1}+3}+\dfrac{3x-2-4}{\sqrt{3x-2}+2}=0\)

\(\Leftrightarrow\dfrac{4\left(x-2\right)}{\sqrt{4x+1}+3}+\dfrac{3\left(x-2\right)}{\sqrt{3x-2}+2}=0\)

\(\Leftrightarrow\left(\dfrac{4}{\sqrt{4x+1}+3}+\dfrac{3}{\sqrt{3x-2}+2}\right)\left(x-2\right)=0\)

Pt \(\dfrac{4}{\sqrt{4x+1}+3}+\dfrac{3}{\sqrt{3x-2}+2}>0\forall x\ge\dfrac{2}{3}\) => vô n_o

=> x - 2 = 0

<=> x = 2 (nhận)

~ ~ ~

Vậy x = 2

mình sửa đề câu 1 

\(x^2-3x-6+\sqrt{x^2-3x}=0\)

\(ĐK:x\le12\)

Đặt \(\hept{\begin{cases}\sqrt[3]{24+x}=a\\\sqrt{12-x}=b\end{cases}\left(b\ge0\right)\Rightarrow}a^3+b^2=36\)

PT trở thành a+b=6

Ta có hệ phương trình \(\hept{\begin{cases}a+b=6\\a^3+b^2=36\end{cases}\Leftrightarrow}\hept{\begin{cases}b=6-a\\a^3+a^2-12a=0\end{cases}}\)

\(\Leftrightarrow\hept{\begin{cases}b=6-a\\a\left(a-3\right)\left(a+4\right)=0\end{cases}}\)

Đến đây đơn giản rồi nhé

Lag tí -.-'

`ĐK:2<=x<=6`

BP 2 vế ta có:

`x-2+6-x+2\sqrt{(x-2)(6-x)}=x^2-8x+24`

`<=>4+2\sqrt{(x-2)(6-x)}=x^2-8x+24`

`<=>2\sqrt{(x-2)(6-x)}=x^2-8x+20`

`<=>2sqrt{-x^2+8x-12}=x^2-8x+20`

`<=>-x^2+8x-20+2sqrt{-x^2+8x-12}=0`

`<=>-x^2+8x-12+2sqrt{-x^2+8x-12}-8=0`

Đặt `sqrt{-x^2+8x-12}=a(a>=0)`

`pt<=>a^2+2a-8=0`

`<=>a=2(tm),a=-4(l)`

`<=>-x^2+8x-12=4`

`<=>x^2-8x+16=0`

`<=>(x-4)^2=0<=>x=4(tmđk)`

Vậy `S={4}`

Học giỏi vậy bạn? $x^2-8x+24=(x-2).(x-6)$ ?? Well =)))

\(\sqrt{x-2}+\sqrt{6-x}\text{=}\sqrt{x^2-8x+24}\)

\(ĐKXĐ:2\le x\le6\)

Xét VP của pt ta thấy : \(\sqrt{x^2-8x+24}\text{=}\sqrt{x^2-8x+16+8}\)

\(\text{=}\sqrt{\left(x-4\right)^2+8}\)

\(\Rightarrow VP\ge\sqrt{8}\)

Xét VT của pt ta có :

\(VT^2\text{=}x-2+6-x+2\sqrt{\left(x-2\right)\left(6-x\right)}\)

\(VT^2\text{=}4+2\sqrt{\left(x-2\right)\left(6-x\right)}\)

Áp dụng BĐT cô si cho 2 số không âm ta có :

\(2\sqrt{\left(x-2\right)\left(6-x\right)}\le\left(\sqrt{x-2}\right)^2+\left(\sqrt{6-x}\right)^2\)

\(\text{=}x-2+6-x\text{=}4\)

\(\Rightarrow VT^2\le8\)

\(\Rightarrow VT\le\sqrt{8}\)

Để \(VT\text{=}VP\) \(\Leftrightarrow\left\{{}\begin{matrix}x-4\text{=}0\\\sqrt{x-2}\text{=}\sqrt{6-x}\end{matrix}\right.\)

\(\Leftrightarrow x=4\left(TM\right)\)

Vậy...........

ĐKXĐ: \(2\le x\le6\)

\(\sqrt{x-2}+\sqrt{6-x}=\sqrt{x^2-8x+24}\\ \Leftrightarrow\left(\sqrt{x-2}+\sqrt{6-x}\right)^2=\left(\sqrt{x^2-8x+24}\right)^2\\ \Leftrightarrow x-2+6-x+2\sqrt{\left(x-2\right)\left(6-x\right)}=x^2-8x+24\\ \Leftrightarrow4+2\sqrt{-x^2+8x-12}=x^2-8x+24\\ \Leftrightarrow-x^2+8x-20+2\sqrt{-x^2+8x-12}=0\left(1\right)\)

Đặt \(\sqrt{-x^2+8x-12}=a\left(a\ge0\right)\), ta có:

\(\left(1\right)\Leftrightarrow a^2+2a-8=0\Leftrightarrow\left[{}\begin{matrix}a=2\left(tm\right)\\a=-4\left(ktm\right)\end{matrix}\right.\)

Ta có:

\(\sqrt{-x^2+8x-12}=2\Leftrightarrow-x^2+8x-12=4\\ \Leftrightarrow-x^2+8x-16=0\\ \Leftrightarrow x^2-8x+16=0\\ \Leftrightarrow\left(x-4\right)^2=0\\ \Leftrightarrow x=4\left(tm\right)\)

Vậy....

P.s: Có gì sai mong mọi người góp ý!

#Lemon

ĐK:....

\(pt\Leftrightarrow x-2+6-x+2\sqrt{\left(x-2\right)\left(6-x\right)}=x^2-8x+24\)

\(\Leftrightarrow4+2\sqrt{-x^2+8x-12}=x^2-8x+24\)

\(\Leftrightarrow2\sqrt{-x^2+8x-12}=x^2-8x+20\)

Đặt \(x^2-8x=a\)

\(pt\Leftrightarrow2\sqrt{-a-12}=a+20\)

\(\Leftrightarrow4\left(-a-12\right)=\left(a+20\right)^2\)

\(\Leftrightarrow a^2+40a+400+4a+48=0\)

\(\Leftrightarrow a^2+44a+448=0\)

\(\Leftrightarrow\left(a+16\right)\left(a+28\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}a=-16\\a=-28\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x^2-8x+16=0\\x^2-8x+28=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}\left(x-4\right)^2=0\\\left(x-4\right)^2+12=0\end{matrix}\right.\)

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

Vậy phương trình có nghiệm duy nhất \(x=4\)