1: Ta có: \(A=\dfrac{2\sqrt{x}-9}{x-5\sqrt{x}+6}-\dfrac{\sqrt{x}+3}{\sqrt{x}-2}-\dfrac{2\sqrt{x}+1}{3-\sqrt{x}}\)

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

\(=\dfrac{2\sqrt{x}-9-x+9+2x-4\sqrt{x}+\sqrt{x}-2}{\left(\sqrt{x}-3\right)\left(\sqrt{x}-2\right)}\)

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

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

Để \(A=-\dfrac{1}{\sqrt{x}}\) thì \(x+\sqrt{x}=-\sqrt{x}+3\)

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

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

\(\Leftrightarrow x=1\left(nhận\right)\)

2: Để A nguyên thì \(\sqrt{x}+1⋮\sqrt{x}-3\)

\(\Leftrightarrow\sqrt{x}-3\in\left\{-1;1;2;-2;4;-4\right\}\)

\(\Leftrightarrow\sqrt{x}\in\left\{2;4;5;1;7\right\}\)

\(\Leftrightarrow x\in\left\{16;25;1;49\right\}\)

9.

\(A>1\Leftrightarrow\dfrac{\sqrt{x}-2}{\sqrt{x}-1}>1\)

\(\Leftrightarrow\dfrac{\sqrt{x}-2}{\sqrt{x}-1}-1>0\)

\(\Leftrightarrow\dfrac{\sqrt{x}-2-\sqrt{x}+1}{\sqrt{x}-1}>0\)

\(\Leftrightarrow\dfrac{-1}{\sqrt{x}-1}>0\)

\(\Leftrightarrow\sqrt{x}-1< 0\)

\(\Leftrightarrow x< 1\)

Kết hợp với điều kiện giả thiết.

10.

\(P< 1\Leftrightarrow\dfrac{\sqrt{x}+1}{\sqrt{x}-1}< 1\)

\(\Leftrightarrow\dfrac{\sqrt{x}+1}{\sqrt{x}-1}-1< 0\)

\(\Leftrightarrow\dfrac{\sqrt{x}+1-\sqrt{x}+1}{\sqrt{x}-1}< 0\)

\(\Leftrightarrow\dfrac{2}{\sqrt{x}-1}< 0\)

\(\Leftrightarrow\sqrt{x}-1< 0\)

\(\Leftrightarrow x< 1\)

Kết hợp với điều kiện giả thiết.

Bài 9:

Để A>1 thì A-1>0

\(\Leftrightarrow\dfrac{\sqrt{x}-2-\sqrt{x}+1}{\sqrt{x}-1}>0\)

\(\Leftrightarrow\dfrac{-1}{\sqrt{x}-1}>0\)

\(\Leftrightarrow\sqrt{x}-1< 0\)

hay x<1

Kết hợp ĐKXĐ, ta được: \(0\le x< 1\)

Bài 10:

Để P<1 thì P-1<0

\(\Leftrightarrow\dfrac{\sqrt{x}+1-\sqrt{x}+1}{\sqrt{x}-1}< 0\)

\(\Leftrightarrow\dfrac{2}{\sqrt{x}-1}< 0\)

\(\Leftrightarrow\sqrt{x}-1< 0\)

hay x<1

Kết hợp ĐKXĐ, ta được: \(0\le x< 1\)

8: Để \(P< \dfrac{1}{4}\) thì \(P-\dfrac{1}{4}< 0\)

\(\Leftrightarrow\dfrac{4\sqrt{x}-8-\sqrt{x}-1}{\sqrt{x}+1}< 0\)

\(\Leftrightarrow3\sqrt{x}< 9\)

hay x<9

Kết hợp ĐKXĐ, ta được: \(\left\{{}\begin{matrix}0\le x< 9\\x\ne1\end{matrix}\right.\)

7.

\(P< 1\Leftrightarrow\dfrac{x+\sqrt{x}}{\sqrt{x}-1}< 1\)

\(\Leftrightarrow\dfrac{x+\sqrt{x}}{\sqrt{x}-1}-1< 0\)

\(\Leftrightarrow\dfrac{x+\sqrt{x}-\sqrt{x}+1}{\sqrt{x}-1}< 0\)

\(\Leftrightarrow\dfrac{x+1}{\sqrt{x}-1}< 0\)

\(\Leftrightarrow\sqrt{x}-1< 0\)

\(\Leftrightarrow x< 1\)

Vậy \(0\le x< 1\)

8.

\(P< \dfrac{1}{4}\Leftrightarrow\dfrac{\sqrt{x}-2}{\sqrt{x}+1}< \dfrac{1}{4}\)

\(\Leftrightarrow4\left(\sqrt{x}-2\right)< \sqrt{x}+1\)

\(\Leftrightarrow4\sqrt{x}-8< \sqrt{x}+1\)

\(\Leftrightarrow3\sqrt{x}< 9\)

\(\Leftrightarrow x< 9\)

Vậy \(0\le x< 9;x\ne1\)

6: Để P>1 thì P-1>0

\(\Leftrightarrow\dfrac{\sqrt{a}-4-\sqrt{a}+2}{\sqrt{a}-2}>0\)

\(\Leftrightarrow\sqrt{a}-2< 0\)

hay a<4

Kết hợp ĐKXĐ, ta được: \(0\le a< 4\)

5: Để P>0 thì \(x-4\sqrt{x}>0\)

\(\Leftrightarrow\sqrt{x}-4>0\)

hay x>16

Em kiểm tra lại đề, mẫu số của phân số đầu tiên chắc chắn bị sai

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

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

2: P<1/2
=>P-1/2<0

=>\(2\sqrt{x}-2-x-1< 0\)

=>-x+2căn x-1<0

=>(căn x-1)^2>0(luôn đúng)

a) ĐKXĐ: \(\left\{{}\begin{matrix}x>0\\x\ne1\end{matrix}\right.\)

Ta có: \(P=\left(\dfrac{\sqrt{x}}{\sqrt{x}-1}-\dfrac{1}{x-\sqrt{x}}\right)\cdot\left(\dfrac{1}{1+\sqrt{x}}+\dfrac{2}{x-1}\right)\)

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

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

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

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

b) Để P>0 thì \(\dfrac{\sqrt{x}+1}{\sqrt{x}\left(\sqrt{x}-1\right)}>0\)

mà \(\sqrt{x}+1>0\forall x\) thỏa mãn ĐKXĐ

nên \(\sqrt{x}\left(\sqrt{x}-1\right)>0\)

mà \(\sqrt{x}>0\forall x\) thỏa mãn ĐKXĐ

nên \(\sqrt{x}-1>0\)

\(\Leftrightarrow\sqrt{x}>1\)

hay x>1

Kết hợp ĐKXĐ,ta được: x>1

Vậy: Để P>0 thì x>1

\(A=\dfrac{x\sqrt{x}-1}{x-\sqrt{x}}+\dfrac{x\sqrt{x}+1}{x+\sqrt{x}}+\dfrac{x+1}{\sqrt{x}}\left(x>0,x\ne1\right)\)

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

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

\(A-\left|A\right|=0\Rightarrow A=\left|A\right|\Rightarrow\left[{}\begin{matrix}A=A\\A=-A\end{matrix}\right.\)

mà \(x>0\Rightarrow A>0\Rightarrow A=A\) (luôn đúng với mọi \(x\in R\) )

Ta có: \(A=\dfrac{x\sqrt{x}-1}{x-\sqrt{x}}+\dfrac{x\sqrt{x}+1}{x+\sqrt{x}}+\dfrac{x+1}{\sqrt{x}}\)

\(=\dfrac{x+\sqrt{x}+1+x-\sqrt{x}+1+x+1}{\sqrt{x}}\)

\(=\dfrac{3x+3}{\sqrt{x}}\)

Để A-|A|=0 thì A=|A|

\(\Leftrightarrow3x+3\ge0\)

hay \(x\ge-1\)

Kết hợp ĐKXĐ, ta được: \(\left\{{}\begin{matrix}x>0\\x\ne1\end{matrix}\right.\)