\(d,\left(2x-1\right)\left(x+3\right)+2x\left(2-x\right)=10-8\left(x+4\right)\\ \Leftrightarrow2x^2+6x-x-3+4x-2x^2=10-8x-32\\ \Leftrightarrow17x=19\Leftrightarrow x=\dfrac{19}{17}\)

vậy phương trình đã cho có nhiệm \(x=\dfrac{19}{17}\)

Ta có: \(\left(2x-1\right)\left(x+3\right)+2x\left(2-x\right)=10-8\left(x+4\right)\)

\(\Leftrightarrow2x^2+6x-x-3+4x-2x^2=-8x-22\)

\(\Leftrightarrow18x=-19\)

hay \(x=-\dfrac{19}{18}\)

1 has never met

2 are playing

3 Have you ever sung

4 has worked

5 will help

6 will wait

7 will phone

8 will pay

9 will stay

10 will invite

11 is studying

12 goes - is going

13 is raining - is sleeping

14 will be

1, has never met

2,are playing

3,Have-ever sung

4,has worked

5, will help

6,will wait

7,will phone

8,will pay

9,will stay

10 will invite

11is studying

12, goes, has gone

13,is raining

14, is sleeping

15, will be

a: Ta có: \(\widehat{ABC}=\widehat{ACB}\)(ΔABC cân tại A)

\(\widehat{ACB}=\widehat{ECN}\)(hai góc đối đỉnh)

Do đó: \(\widehat{ABC}=\widehat{ECN}\)

Xét ΔMBD vuông tại D và ΔNCE vuông tại E có

BD=CE

\(\widehat{MBD}=\widehat{NCE}\)

Do đó: ΔMBD=ΔNCE

=>DM=EN

b: Ta có: DM\(\perp\)BC

EN\(\perp\)BC

Do đó: DM//EN

Xét ΔIDM vuông tại D và ΔIEN vuông tại E có

MD=EN

\(\widehat{MDI}=\widehat{ENC}\)(hai góc so le trong, DM//EN)

Do đó: ΔIDM=ΔIEN

=>IM=IN

=>I là trung điểm của MN

9. is/ tells

10. are

11. has

12. isn't

--------

B3

1. is

2. teaches

3. learn

4. comes

5. has

6. goes

7. meets

8. drinks

------------

B4

1. plays

2. drink

3. starts

4. live

5. do

6. speak

7. watches

------------

B5

1. does -> do

2. Do -> Does

3. watch -> watches

4. goes -> go

5. carries -> carry

6. don't -> doesn't

7. plays -> play

8. are -> is

bài nào vs ak

9. is/ tells.

10. are.

11. has.

12. isn't.

B3

1. is.

2. teaches.

3. learn.

4. comes.

5. has.

6. goes.

7. meets.

8. drinks.

B4

1. plays.

2. drink.

3. starts.

4. live.

5. do.

6. speak.

7. watches.

B5

1. does -> do.

2. Do -> Does.

3. watch -> watches.

4. goes -> go.

5. carries -> carry.

6. don't -> doesn't.

7. plays -> play.

8. are -> is.

Ex6

1 was

2 had been

3 found

4 had talked

5 had spoken

6 snowed

7 were

8 painted

9 had

10 had known

Ex7

2 had got

3 had hurt

4 were

5 were

6 was

7 wanted

8 ?

9 stopped

10 had eaten

- Nén một tập giấy thật chặt.

- Dùng thước thẳng đo tính xác bề dày tập giấy đó.

- Lấy kết quả vừa đo được chia cho số tờ của tập giấy.

* Đo đường kính sợi chỉ:

- Ta quấn 20 - 30 vòng chỉ xung quanh bút chì.

- Đánh dấu độ dài chỉ đã quấn.

- Dùng thước đo phù hợp để đo độ dài đã đánh dấu.

- Lấy kết quả vừa đo được chia cho số vòng dây.

c, 18/-5 . -15/20

= 18.(-15)/(-5).20

= 270/100 = 27/10

d, 115/30 : - 5/6

= 115/30 . 6/-5

= 115.6/30.(-5)

= 690/-15

= -46

HỌC TỐT!

Trả lời:

= -46 nhé bn\

~HT~

Kick cho mik nha:33