\(c,\dfrac{6}{2-\sqrt{10}}+\dfrac{5\sqrt{2}-2\sqrt{5}}{\sqrt{5}-\sqrt{2}}\\ =\dfrac{6\left(2+\sqrt{10}\right)}{4-10}+\dfrac{\sqrt{2}.\sqrt{5}\left(\sqrt{5}-\sqrt{2}\right)}{\sqrt{5}-\sqrt{2}}\\ =-\left(2+\sqrt{10}\right)+\sqrt{10}\\ =-2-\sqrt{10}+\sqrt{10}\\ =-2\)

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

Để A nguyên : 

\(x+1\inƯ\left(1\right)\\ Ư\left(1\right)=\left\{1;-1\right\}\\ \Rightarrow\left\{{}\begin{matrix}x+1=1\\x+1=-1\end{matrix}\right.\\ \Rightarrow\left\{{}\begin{matrix}x=0\\x=-2\end{matrix}\right.\)

\(1,y^2-8y+16\\ =y^2-2.4.y+4^2\\ =\left(y-4\right)^2\\ 2,1+2x+x^2=\left(1+x\right)^2\\ 3,9x^2+12x+4=\left(3x\right)^2+2.3x.2+2^2\\ =\left(3x+2\right)^2\\ 4,9-12y+4y^2\\ =\left(3-2y\right)^2\\ 5,49+7x+\dfrac{1}{4}x^2\\ =7^2+2.\dfrac{1}{2}x.7+\left(\dfrac{1}{2}x\right)^2\\ =\left(7+\dfrac{1}{2}x\right)^2\\ 6,x^2-10x+25=\left(x-5\right)^2\)

5 When I left the house this morning, I didn't have breakfast

6 After I had finished all my work,Ben arrived

7 By the time I finished all my work,Ben had arrived

8 By the time I went to the supermarket, I had prepared dinner for my family.

9 Before Mr. Brown returned home as an excellent engineer, he had studied abroad for four years

10 Before my brother felt a little bit better, he had drank some orange juice 

By the time , Before QKĐ , QKHT 

After QKHT , QKĐ 

When QKĐ , QKĐ 

có than là so sánh đó bạn 

 1.When you get up ? \(\Rightarrow\) When do you get up ?

2.We doesn't read comics in class. \(\Rightarrow\) don't 

3.Tom's birthday is at 25 December \(\Rightarrow\) on

4.Our teacher says: "Talk not in class, please" \(\Rightarrow\) Don't talk

5.There aren't some shops in our street. \(\Rightarrow\) any 

1- unforgettable

2- more important ( có than )

3- experience

4- experienced

5- necessary

6- traditional 

7- excited

8- attractions

9- incredibly

10- crowded

11- traditional 

12- tasty 

13- boneless

14- unhealthy 

15 - healthily 

1-C

2- D

3- B

4- A

5- C

6- A trọng âm 1 còn lại 2

7- Tất cả đều là 1 

8- B 1 còn lại là 2 

F

F

F

T

F

T