Điều kiện xác định : \(\hept{\begin{cases}2\ge\frac{1}{\sqrt{2-x}}\\x< 2\\x\ge0\end{cases}}\) \(\Leftrightarrow0\le x\le\frac{7}{4}\)

Ta có : \(\sqrt{2-\frac{1}{\sqrt{2-x}}}=x\)

\(\Rightarrow2-\frac{1}{\sqrt{2-x}}=x^2\)

\(\Leftrightarrow x^2\sqrt{2-x}-2\sqrt{2-x}+1=0\)

Đặt \(t=\sqrt{2-x},t\ge0\Rightarrow x=2-t^2\)

Ta có : \(\left(2-t^2\right)^2.t-2t+1=0\)

\(\Leftrightarrow t\left[\left(2-t^2\right)^2-1\right]-\left(t-1\right)=0\)

\(\Leftrightarrow t\left(2-t^2-1\right)\left(2-t^2+1\right)-\left(t-1\right)=0\)

\(\Leftrightarrow t\left(t-1\right)\left(t+1\right)\left(t^2-3\right)-\left(t-1\right)=0\)

\(\Leftrightarrow\left(t-1\right)\left[t\left(t+1\right)\left(t^2-3\right)-1\right]=0\)

\(\Leftrightarrow\orbr{\begin{cases}t-1=0\\t\left(t+1\right)\left(t^2-3\right)-1=0\end{cases}}\)

Vậy pt có nghiệm x = 1

toán mấy ạ

sai đề đó bạn

\(A=\sqrt{4x+1}-\sqrt{3x-2}=\frac{x+3}{2}\)

đkxđ \(\hept{\begin{cases}x\ge-\frac{1}{4}\\x\ge\frac{2}{3}\end{cases}}\)

đặt t=x+3 phương trình trở thành 

\(A=\sqrt{4\left[x+3\right]-11}-\sqrt{3\left[x+3\right]-11}=\frac{x+3}{2}\)

\(A=\sqrt{4t-11}-\sqrt{3t-11}=\frac{t}{2}\)

\(\Leftrightarrow4t-11=\frac{t^2}{4}+3t-11+t\sqrt{3t-11}\)

\(\Leftrightarrow t^2-\frac{t^2}{4}=t\sqrt{3t-11}\)

\(\Leftrightarrow\frac{t\left[4-t\right]}{4}=t\sqrt{3t-11}\)

\(\Leftrightarrow\frac{\left[4-t\right]^2}{16}=3t-11\)

\(\Leftrightarrow t^2-56t+192=0\)

\(\Leftrightarrow\orbr{\begin{cases}t=28+4\sqrt{37}\\t=28-4\sqrt{37}\end{cases}}\)

thế vào x+3=t suy ra 

\(\orbr{\begin{cases}x=25+4\sqrt{37}\left[loại\right]\\x=25-4\sqrt{37}\left[nhận\right]\end{cases}}\)

\(S=\left\{25-4\sqrt{37}\right\}\)

đk tự giải nhé 

với x tjỏa mãn đk ta có 

\(\sqrt{\frac{x^2+3}{x}}=\frac{x^2+7}{2\left(x+1\right)}\Leftrightarrow\sqrt{x^3+3}=\frac{x^3+7x}{2\left(x+1\right)}\)

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

đặt \(\sqrt{x^3+3x}=a\)

ta có pt<=> \(a=\frac{a^2+4x}{2\left(x+1\right)}\Leftrightarrow2a\left(x+1\right)=a^2+4x\)

\(\Leftrightarrow2ax+2a=a^2+4x\Leftrightarrow a^2+4ax-2a-2ax=0\)

\(\Leftrightarrow\left(a^2-2ax\right)-\left(2a-4x\right)=0\Leftrightarrow a\left(a-2x\right)-2\left(a-2x\right)=0\)

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

đến đây tự làm nhé

ĐK: \(x^4-4x^3+14x-11\ge0\) (*)

\(PT\Leftrightarrow\left\{{}\begin{matrix}x\le1\\x^4-4x^3+14x-11=x^2-2x+1\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x\le1\\x^4-4x^3-x^2+16x-12=0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x\le1\\\left(x-1\right)\left(x-2\right)\left(x-3\right)\left(x+2\right)=0\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}x=1\\x=-2\end{matrix}\right.\)(tm)

e/ ĐKXĐ: \(x\ge1\)

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

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

\(\Leftrightarrow x-1=x^2-2x+1\)

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

f/ \(\Leftrightarrow\left\{{}\begin{matrix}x+5\ge0\\x^3+x^2+6x+28=\left(x+5\right)^2\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x\ge-5\\x^3-4x+3=0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x\ge-5\\\left(x-1\right)\left(x^2+x-3\right)=0\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=1\\x=\frac{-1\pm\sqrt{13}}{2}\\\end{matrix}\right.\)

a/ ĐKXĐ: ...

\(\Leftrightarrow9x+3\sqrt{x^2-x-1}=7x+7\)

\(\Leftrightarrow3\sqrt{x^2-x-1}=7-2x\)

\(\Leftrightarrow\left\{{}\begin{matrix}x\le\frac{7}{2}\\9\left(x^2-x-1\right)=\left(7-2x\right)^2\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}x\le\frac{7}{2}\\5x^2+19x-58=0\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=2\\x=-\frac{29}{5}\end{matrix}\right.\)

b/ ĐKXĐ: \(x\ne1\)

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

\(\Leftrightarrow\frac{1}{\left|x-1\right|}=\frac{1}{x-1}\)

\(\Rightarrow x-1>0\Rightarrow x>1\)

\(\Leftrightarrow x+y+z=2\sqrt{x-2}+2\sqrt{y+2003}+2\sqrt{z-2004}\)

\(\Leftrightarrow\left(x-2-2\sqrt{x-2}+1\right)+\left(y+2003-2\sqrt{y+2003}+1\right)\)

\(+\left(z-2004-2\sqrt{z-2004}+1\right)=0\)

\(\Leftrightarrow\left(\sqrt{x-2}-1\right)^2+\left(\sqrt{y+2003}-1\right)^2+\left(\sqrt{z-2004}-1\right)^2=0\)

Vì biểu thức trên là tổng của các số hạng không âm nên nó bằng 0 khi và chỉ khi các số hạng phải bằng 0

\(\Leftrightarrow\hept{\begin{cases}\sqrt{x-2}=1\\\sqrt{y-2003}=1\\\sqrt{z-2004}=1\end{cases}\Leftrightarrow\hept{\begin{cases}x=3\\y=2004\\z=2005\end{cases}}}\)

\(ĐK:x\ge2,y\ge-2003,z\ge2004\)

Pt đã cho tương đương :

\(x+y+z-2\sqrt{x-2}-2\sqrt{y+2003}-2\sqrt{z-2004}=0\)

\(\Leftrightarrow\left(x-2-2\sqrt{x-2}+1\right)+\left(y+2003-2\sqrt{y+2003}+1\right)+\left(z-2004-2\sqrt{z-2004}+1\right)\)\(=0\)

\(\Leftrightarrow\left(\sqrt{x-2}-1\right)^2+\left(\sqrt{y+2003}-1\right)^2+\left(\sqrt{z-2004}-1\right)^2=0\)

Dấu "=" xảy ra \(\Leftrightarrow\hept{\begin{cases}x-2=1\\y+2003=1\\z-2004=1\end{cases}\Leftrightarrow}\hept{\begin{cases}x=3\\y=-2002\\z=2005\end{cases}}\)(Thỏa mãn)

ĐKXĐ:...

Đặt \(\frac{x}{\sqrt{1-x^2}}=t\Rightarrow t^2=\frac{x^2}{1-x^2}=\frac{1}{1-x^2}-1\)

Pt trở thành:

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

\(\Leftrightarrow\left[{}\begin{matrix}\frac{1}{1-x^2}=t^2+1=2\\\frac{1}{1-x^2}=t^2+1=5\end{matrix}\right.\) \(\Leftrightarrow\left[{}\begin{matrix}x^2=\frac{1}{2}\\x^2=\frac{4}{5}\end{matrix}\right.\)

\(\Leftrightarrow...\)