Tờ 1

41 It's very important to use body language in communication

42 Despite her age, she still leads an active life

43 My mother said that you had to decorate the room carefully

44 People recycle old cans to make new ones

45 Tim is always forgetting his homework

46 T

47 F

48 T

49 T

50 F

Tờ 2

17 C => hard

18 do => make

19 D => has

20 to go => going

21 A => At

22 B => to

23 C => beautifully

24 D => five-star

25 is => was

V

26 would travel

27 be

28 to buy

29 has spoken

30 Has - just been finished

VI

31 for

32 as

33 about

34 with

35 than

VII

36 development

37 exploration

38 behavior

39 deforestation

40 specialness

Tờ 3

IV

1 sat

2 Was - published

3 would help

4 had left

5 cleaning

V

21 belonging

22 arrangement

23 household

24 cruelty

25 unacceptable

VI

26 C => with

27 A => the prettier

28 C => not smoke

29 C => going

30 A => Despite

VII

31 in

32 of

33 up

34 of

35 for

VIII

36 When we were children, we used to flight our kites in the afternoons

37 She prectise playing the guitar more regularly than her sister

38 He will fail the next exam unless he study hard

9 goes 

10 listen 

nha bạn

1) He always drives his car out of the garage at nine o'clock . 

2) They find a parking place near the shops rarely 

3) I sometimes fly with my parents to Florida in spring 

4) She often comes to school late in the winter 

5) They always meet their friends at the sports ground after dinner 

6) She always enjoys swimming in our pool in the morning 

7) On Mondays, my mother always does the washing 

8) I put out the dustbins once a week . 

9) We often go for a walk with our dog 

10) My sister sometimes does the ironing , 

9.goes

10.listen

V

1. He always drives his car out of the garage at nine o'clock in the morning.

2. They rarely find a parking place near the shops.

3. I sometimes fly with my parents to Florida in winter.

4. She often came late to school in spring last year.

5. They always meet their friends at the sports ground after dinner.

6. She always enjoys swimming very much in our pool in the morning.

7. On Mondays my mother always does the washing.

. 8. I usually put out the dustbins once a week.

9. We often go for a walk with our dog.

10. My sister sometimes does the ironing.

 ht

9. Has the work been done by him?

10. The boxes were opened and cigarettes were taken out by us

11. She was given a new one

12. He is proved wrong

13. We were promised higher wages

14. This is the third time we have been written to about this by them

15. We were asked to be there at 8 o'clock

16. She is being shown how to do it

Mình sẽ tặng coin cho người làm đầu tiên nha

a) Áp dụng định lí Pytago vào ΔABC vuông tại A, ta được:

\(BC^2=AB^2+AC^2\)

\(\Leftrightarrow BC^2=3^2+4^2=25\)

hay BC=5(cm)

b) Xét ΔABC có AB<AC<BC(3cm<4cm<5cm)

mà góc đối diện với cạnh AB là \(\widehat{ACB}\)

và góc đối diện với cạnh AC là \(\widehat{ABC}\)

và góc đối diện với cạnh BC là \(\widehat{BAC}\)

nên \(\widehat{ACB}< \widehat{ABC}< \widehat{BAC}\)

Xét ΔABC có 

HB là hình chiếu của AB trên BC

HC là hình chiếu của AC trên BC

AB<AC

Do đó: HB<HC

c) Xét ΔCAB vuông tại A và ΔCAD vuông tại A có 

CA chung

AB=AD(gt)

Do đó: ΔCAB=ΔCAD(hai cạnh góc vuông)

Suy ra: CB=CD(hai cạnh tương ứng)

Xét ΔCBD có CB=CD(cmt)

nên ΔCBD cân tại C(Định nghĩa tam giác cân)

d: Xét ΔCBD có 

CA là đường cao ứng với cạnh DB

BK là đường cao ứng với cạnh CD

CA cắt BK tại F

Do đó: F là trực tâm của ΔCBD(Tính chất ba đường cao của tam giác)

Suy ra: DF\(\perp\)BC

Ta có: DF\(\perp\)BC(cmt)

AH\(\perp\)BC(gt)

Do đó: DF//AH(Định lí 1 từ vuông góc tới song song)

Xét ΔFAB vuông tại A và ΔFAD vuông tại A có 

FA chung

AB=AD

Do đó: ΔFAB=ΔFAD

Suy ra: FB=FD(hai cạnh tương ứng

Xét ΔFBD có FB=FD

nên ΔFBD cân tại F

e: Xét ΔFBD có 

A là trung điểm của BD

AE//DF

Do đó: E là trung điểm của BF

c. \(\left|\dfrac{8}{4}-\left|x-\dfrac{1}{4}\right|\right|-\dfrac{1}{2}=\dfrac{3}{4}\)

\(\Rightarrow\left[{}\begin{matrix}\left|\dfrac{8}{4}-x+\dfrac{1}{4}\right|-\dfrac{1}{2}=\dfrac{3}{4}\\\left|\dfrac{8}{4}+x-\dfrac{1}{4}\right|-\dfrac{1}{2}=\dfrac{3}{4}\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}\left|\dfrac{9}{4}-x\right|-\dfrac{1}{2}=\dfrac{3}{4}\\\left|\dfrac{7}{4}+x\right|-\dfrac{1}{2}=\dfrac{3}{4}\end{matrix}\right.\)

\(\Rightarrow\left[{}\begin{matrix}\left[{}\begin{matrix}\dfrac{9}{4}-x-\dfrac{1}{2}=\dfrac{3}{4}\\x=\dfrac{9}{4}-\dfrac{1}{2}=\dfrac{3}{4}\end{matrix}\right.\\\left[{}\begin{matrix}\dfrac{7}{4}+x-\dfrac{1}{2}=\dfrac{3}{4}\\-\dfrac{7}{4}-x-\dfrac{1}{2}=\dfrac{3}{4}\end{matrix}\right.\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}\left[{}\begin{matrix}x=1\\x=\dfrac{7}{2}\end{matrix}\right.\\\left[{}\begin{matrix}x=-\dfrac{1}{2}\\x=-3\end{matrix}\right.\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=1\\x=\dfrac{7}{2}\\x=-3\end{matrix}\right.\) 

Ở nơi x=9/4-1/2 là x-9/4-1/2 nha

a. -1,5 + 2x = 2,5

<=> 2x = 2,5 + 1,5

<=> 2x = 4

<=> x = 2

b. \(\dfrac{3}{2}\left(x+5\right)-\dfrac{1}{2}=\dfrac{4}{3}\)

<=> \(\dfrac{3}{2}x+\dfrac{15}{2}-\dfrac{1}{2}=\dfrac{4}{3}\)

<=> \(\dfrac{9x}{6}+\dfrac{45}{6}-\dfrac{3}{6}=\dfrac{8}{6}\)

<=> 9x + 45 - 3 = 8

<=> 9x = 8 + 3 - 45

<=> 9x = -34

<=> x = \(\dfrac{-34}{9}\)

1. that
2. that night
3. the day before.
4. my
5. that evening
6. the previous week
7. her
8. there
9. the following day
10. two hours
11. then

1.that 

 2.that night

3.the day before

4.my 

5.that night 

6.the previous week

7.her  8.there  9 the following day   10.two hours before   11.then

1. that
2. that night
3. the day before.
4. my
5. that evening
6. the previous week
7. her
8. there
9. the following day
10. two hours
11. then