ĐK: x>0

Đặt a=1/x ta được: a>0

\(a+\frac{1}{3}=\sqrt{\frac{1}{9}+a\sqrt{\frac{4}{9}+2a^2}}\)

\(\Leftrightarrow a^2+\frac{1}{9}+\frac{2}{3}a=\frac{1}{9}+a\sqrt{\frac{4}{9}+2a^2}\)

<=>\(a^2+\frac{2}{3}a=a\sqrt{\frac{4}{9}+2a^2}\)

<=>\(a.\left(a+\frac{2}{3}\right)=a\sqrt{\frac{4}{9}+2a^2}\)

<=>\(a+\frac{2}{3}=\sqrt{\frac{4}{9}+2a^2}\)

<=>\(a^2+\frac{4}{9}+\frac{4}{3}a=\frac{4}{9}+2a^2\)

<=>\(a^2-\frac{4}{3}a=0\Leftrightarrow a=0\left(loại\right);a=\frac{4}{3}\)

<=>\(x=\frac{3}{4}\)(loại -3/2)

Vậy x=3/4

ĐKXĐ: \(-3\le x\le3;x\ne0\)

Đặt \(\sqrt{9-x^2}=a\left(a\ge0;a\ne3\right)\Rightarrow x^2=9-a^2\),khi đó pt đã cho trở thành:

\(\frac{9-a^2}{3+a}+\frac{1}{4\left(3-a\right)}=1\)

\(\Rightarrow3-a+\frac{1}{4\left(3-a\right)}=1\)

\(\Rightarrow\frac{4\cdot\left(3-a\right)^2+1}{4\left(3-a\right)}=1\Rightarrow4a^2-24a+37=12-4a\)

\(\Rightarrow4a^2-20a+25=0\Rightarrow\left(2a-5\right)^2=0\Rightarrow2a-5=0\)

\(\Rightarrow a=\frac{5}{2}\)(tm điều kiện),theo cách đặt ta có

\(\sqrt{9-x^2}=\frac{5}{2}\Rightarrow9-x^2=\frac{25}{4}\Rightarrow x^2=\frac{11}{4}\Rightarrow x=\frac{\sqrt{11}}{2}\)(TMĐKXĐ)

Vậy pt đã cho có nghiệm duy nhất là \(x=\frac{\sqrt{11}}{2}\)

B4

a) \(\frac{9}{\sqrt{3}}=\frac{9\cdot\sqrt{3}}{\sqrt{3}\cdot\sqrt{3}}=\frac{9\sqrt{3}}{3}=3\sqrt{3}\)

b)\(\frac{3}{\sqrt{5}-\sqrt{2}}=\frac{3\left(\sqrt{5}+\sqrt{2}\right)}{\left(\sqrt{5}-\sqrt{2}\right)\left(\sqrt{5}+\sqrt{2}\right)}=\frac{3\left(\sqrt{5}+\sqrt{2}\right)}{3}=\sqrt{5}+\sqrt{2}\)

c)\(\frac{\sqrt{2}+1}{\sqrt{2}-1}=\frac{\left(\sqrt{2}+1\right)\left(\sqrt{2}+1\right)}{\left(\sqrt{2}-1\right)\left(\sqrt{2}+1\right)}=\frac{\left(\sqrt{2}+1\right)^2}{1}=\left(\sqrt{2}+1\right)^2\)

d)\(\frac{1}{7+4\sqrt{3}}+\frac{1}{7-4\sqrt{3}}=\frac{7-4\sqrt{3}+7+4\sqrt{3}}{\left(7+4\sqrt{3}\right)\left(7-4\sqrt{3}\right)}=\frac{14}{1}=14\)

B3

a)\(\frac{1}{2}\sqrt{x-1}-\frac{3}{2}\sqrt{9x-9}+24\sqrt{\frac{x-1}{64}}=-17\) \(đk:x\ge1\)

\(\frac{1}{2}\sqrt{x-1}-\frac{9}{2}\sqrt{x-1}+3\sqrt{x-1}=-17\)

\(\sqrt{x-1}\cdot\left(\frac{1}{2}-\frac{9}{2}+3\right)=-17\)

\(\sqrt{x-1}\cdot\left(-1\right)=-17\)

\(\sqrt{x-1}=17\)

\(\left[{}\begin{matrix}x-1=289\left(tm\right)\\x-1=-289\left(ktm\right)\end{matrix}\right.\)

\(x=290\left(tm\right)\)

b)\(\sqrt{4x^2-9}=2\sqrt{2x+3}\) \(đk:x\ge-\frac{3}{2}\)

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

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

\(\left[{}\begin{matrix}\sqrt{2x+3}=0\\\sqrt{2x-3}-2=0\end{matrix}\right.\left[{}\begin{matrix}2x+3=0\\\sqrt{2x-3}=2\end{matrix}\right.\left[{}\begin{matrix}x=-\frac{3}{2}\\2x-3=4\left(tm\right)\\2x-3=-4\left(ktm\right)\end{matrix}\right.\left[{}\begin{matrix}x=-\frac{3}{2}\left(tm\right)\\x=\frac{7}{2}\left(tm\right)\end{matrix}\right.\)

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

ĐK: \(x\ge0\)

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

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

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

\(\Leftrightarrow\sqrt{2x+1}=\sqrt{3x}\Rightarrow x=1\left(tm\right)\)

ai giải hộ mk ý a vs ý c

c) \(x^3y+xy^3-3x^2-3y^2=17\)

\(\Leftrightarrow xy\left(x^2+y^2\right)-3\left(x^2+y^2\right)=17\Leftrightarrow\left(x^2+y^2\right)\left(xy-3\right)=17\)

\(\Leftrightarrow\left(x^2+y^2\right),\left(xy-3\right)\inƯ\left(17\right)\)

Do \(x^2+y^2\ge0\Rightarrow x^2+y^2\in\left\{1;17\right\}\)

TH1:  \(\hept{\begin{cases}x^2+y^2=1\\xy-3=17\end{cases}}\Rightarrow\hept{\begin{cases}\frac{400}{y^2}+y^2=1\\x=\frac{20}{y}\end{cases}}\) (vô nghiệm)

TH2:  \(\hept{\begin{cases}x^2+y^2=17\\xy-3=1\end{cases}}\Rightarrow\hept{\begin{cases}\frac{16}{y^2}+y^2=17\\x=\frac{4}{y}\end{cases}}\)

Ta có bảng:

Vậy các cặp số nguyên thỏa mãn là (x;y) = (1;4) ; (-1;-4) ; (4;1) ; (-4;-1).

a/ ĐKXĐ: ...

\(\Leftrightarrow2\sqrt{\frac{x}{x-1}}-\sqrt{\frac{x-1}{x}}=\frac{2\left(x-1\right)}{x}+3\)

Đặt \(\sqrt{\frac{x-1}{x}}=a>0\)

\(\frac{2}{a}-a=2a^2+3\Leftrightarrow2a^3+a^2+3a-2=0\)

\(\Leftrightarrow\left(2a-1\right)\left(a^2+a+2\right)=0\Leftrightarrow a=\frac{1}{2}\)

\(\Rightarrow\sqrt{\frac{x-1}{x}}=\frac{1}{2}\Leftrightarrow4\left(x-1\right)=x\)

b/ ĐKXĐ: ...

\(\Leftrightarrow3\sqrt{\frac{2x}{x-1}}+4\sqrt{\frac{x-1}{2x}}=\frac{3\left(x-1\right)}{2x}+10\)

Đặt \(\sqrt{\frac{x-1}{2x}}=a>0\)

\(\frac{3}{a}+4a=3a^2+10\Leftrightarrow3a^3-4a^2+10a-3=0\)

\(\Leftrightarrow\left(3a-1\right)\left(a^2-a+3\right)=0\Leftrightarrow a=\frac{1}{3}\)

\(\Leftrightarrow\sqrt{\frac{x-1}{2x}}=\frac{1}{3}\Leftrightarrow9\left(x-1\right)=2x\)

c/ ĐKXĐ: ...

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

Đặt \(\sqrt{\frac{3-2x}{x}}=a>0\)

\(\frac{1}{a}+5a=4a^2+5\Leftrightarrow4a^3-5a^2+5a-1=0\)

\(\Leftrightarrow\left(4a-1\right)\left(a^2-a+1\right)=0\Leftrightarrow a=\frac{1}{4}\)

\(\Leftrightarrow\sqrt{\frac{3-2x}{x}}=\frac{1}{4}\Leftrightarrow16\left(3-2x\right)=x\)

d/ ĐKXĐ: ...

Đặt \(\sqrt{\frac{x-1}{x}}=a>0\)

\(a^2-2a=3\Leftrightarrow a^2-2a-3=0\Rightarrow\left[{}\begin{matrix}a=-1\left(l\right)\\a=3\end{matrix}\right.\)

\(\Leftrightarrow\sqrt{\frac{x-1}{x}}=3\Leftrightarrow x-1=9x\)

e/ ĐKXĐ: ...

Đặt \(\sqrt{\frac{x}{x-1}}=a>0\)

\(a+\frac{1}{a}=\frac{3}{\sqrt{2}}\Leftrightarrow a^2-\frac{3}{\sqrt{2}}a+1=0\)

\(\Rightarrow\left[{}\begin{matrix}a=\sqrt{2}\\a=\frac{\sqrt{2}}{2}\end{matrix}\right.\)

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

f/ ĐKXĐ: ...

\(\Leftrightarrow\sqrt{\frac{x^2-1}{x}}=\frac{1-x}{\sqrt{x}}\)

Bình phương 2 vế:

\(\frac{x^2-1}{x}=\frac{\left(1-x\right)^2}{x}\Leftrightarrow x^2-1=x^2-2x+1\)

\(\Rightarrow x=1\)