\(A=\left(\dfrac{x+2}{x\sqrt{x}-1}+\dfrac{\sqrt{x}}{x+\sqrt{x}+1}+\dfrac{1}{1-\sqrt{x}}\right):\dfrac{\sqrt{x}-1}{2}\left(x\ge0;x\ne1\right)\\ A=\dfrac{x+2+\sqrt{x}\left(\sqrt{x}-1\right)-\left(x+\sqrt{x}+1\right)}{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}\cdot\dfrac{2}{\sqrt{x}-1}\\ A=\dfrac{x+2+x-\sqrt{x}-x-\sqrt{x}-1}{\left(\sqrt{x}-1\right)\left(x+\sqrt{x}+1\right)}\cdot\dfrac{2}{\sqrt{x}-1}\)

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

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

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

\(=\dfrac{2}{x+\sqrt{x}+1}\)

\(a,k=\dfrac{y}{x}=\dfrac{4}{3}\\ b,y=\dfrac{4}{3}x\\ c,x=-12\rightarrow y=\dfrac{4}{3}(-12)=-16\\ x=3\rightarrow y=\dfrac{4}{3}.3=4\)

đừng thử thách mắt tui vậy chứ T.T

1 meeting - to see

2 drinking

3 waiting

4 playing

5 staying - playing

6 to go

7 making

8 spending

9 surfing - surfing

10 to concentrate - wandering

1 C

2 A

3 C

4 A

5 D

6 C

7 A

8 C

9 C

10 C

1 How often does your mother watch films

2 When did they go to the movies

3 Who do you love hanging out with?

4 Why don't you give your personal information to websites?

5 How long should children spend a day on screens

6 What is the most popular pastime in your country

7 Where did the art of paper folding orginate

8 How long does 1 vs 100 game show last

1 This dish is brought to me by the waiter

2 All the world's oil will be used up in the next 100 years 

3 This story was told to themby their grandmother when they visited her last week.

4 Have the Christmas cards been sent to your family?

5 Ann was given some bananas and some flowers by us

B. Lẽ phải