1.We (do) this for you if you want.

-> We will do this for you if you want.

2.If we(need)  some help, we will ask

-> If we need some help, we will ask.

3.If Peter stays with his grandparents,Susan(not be) happy

-> If Peter stays with his grandparents,Susan won't be happy.

4.If we win the money, we (buy) a new house

-> If we win the money, we will buy a new house.

5.She (not write) to you if she leaves.

-> She won't write to you if she leaves.

6.We (go)  on holiday if there is time.

-> We will go  on holiday if there is time.

7. If we  (plant) more trees , the air (be) fresher

-> If we plant more trees , the air will be fresher.

8.If the soil (be) polluted, the vegetables (die).

-> If the soil is polluted, the vegetables will die.

9. Unless he (call) me,I (stay) at home .

-> Unless he calls me,I will stay at home .

10.The weather is not very good. It might (rain) this afternoon.

-> The weather is not very good. It might rain this afternoon.

11.If a student (recycle) the papers,he (save energy).

-> If a student recycles the papers,he will save energy.

12.I (not clean) my room for a long time.

-> I haven't cleaned my room for a long time.

1.We (do)    will do             this for you if you want.

2.If we(need)       need          some help, we will ask

3.If Peter stays with his grandparents,Susan(not be)     won't         happy

4.If we win the money, we ((buy)     will buy          a new house

5.She(not write)    won't write             to you if she leaves

6.We (go)     will go         on holiday if there is time

7. If we     plant    (plant) more trees , the air     will be           (be) fresher

8.If the soil      is      (be) polluted, the vegetables   will die          (die)

9.Unless he     calls         (call)me,I     will stay         (stay) at home 

10.The weather is not very good. It might      rain           (rain) this afternoon

11.If a student     recycles          (recycle) the papers,he   will save energy          (save energy

12.I      haven't clean            (not clean) my room for a long time

* Bạn áp dụng cấu trúc câu đk loại 1 :

| If + thì hiện tại đơn , will + động từ nguyên mẫu |.

Ta có: \(13^{184}=\left(13^4\right)^{46}=\left(\overline{...1}\right)^{46}=\overline{...1}\)

Vì 1 chia cho 5 dư 1 nên 13¹⁸⁴ chia cho 5 dư 1

Số dư của phép chia 13¹⁸⁴ cho 5 sẽ bằng số dư trong phép chia chữ số tận cùng của 13¹⁸⁴ cho 5 

a,\(\left(x-15\right):50+22=24\)

\(< =>\frac{\left(x-15\right)}{50}=2< =>x-15=100\)

\(< =>x=100+15=115\)

b,\(42-\left(2x+32\right)+12:2=6\)

\(< =>42-2x-32=0\)

\(< =>10-2x=0< =>x=\frac{10}{2}=5\)

Làm nốt :

c) \(134-2\left\{156-6\cdot\left[54-2\cdot\left(9+6\right)\right]\right\}\cdot x=86\)

=> 134 - 2{156 - 6 . [54 - 2 . 15]} . x = 86

=> 134 - 2{156 - 6 . [54 - 30]} . x = 86

=> 134 - 2{156 - 6. 24} . x = 86

=> 134 - 2{156 - 144} . x = 86

=> 134 - 2.12 . x = 86

=> 134 - 24 . x = 86

=> 24.x = 48

=> x = 2

Bài 2 : a) 120 : [21 - (4x - 4)] = 2³.3

=> 120 : [21 - (4x - 4)] = 8.3

=> 120 : [21 - (4x - 4)] = 24

=> 21 - (4x - 4) = 5

=> 4x - 4 = 16

=> 4x = 20

=> x = 5

b) 3.[205 - (x - 9)] - 486 = 0

=> 3.[205 - (x - 9)] = 486

=> 205 - (x - 9) = 162

=> x - 9 = 205 - 162 = 43

=> x = 43 + 9 = 52

c) 204 - 2{200 - 5.[64 - 2.(11 + 6)]} . x = 4

=> 204 - 2{200 - 5.[64 - 2.17]} . x = 4

=> 204 - 2{200 - 5 .[64 - 34]}.x = 4

=> 204 - 2{200 - 5.30} . x = 4

=> 204 - 2{200 - 150}.x = 4

=> 204 - 2.50 . x = 4

=> 2.50.x = 200

=> 100.x = 200

=> x = 2

mỗi quý có 3 tháng, tập hợp A gồm các tháng 4,5,6 nha

Một năm gồm 4 quý có nghĩa là 4 mùa đó bạn . Tập hợp  A={ tháng 4; tháng 5; tháng 6}

Sửa đề chút : Tính nhanh 1 - 2 - 3 + 4 + 5 - 6 - 7 + 8 + ... + 1997 - 1998 - 1999 + 2000 + 2001

 1 - 2 - 3 + 4 + 5 - 6 - 7 + 8 + ... + 1997 - 1998 - 1999 + 2000 + 2001

= ( 1 - 2 - 3 + 4 ) + ( 5 - 6 - 7 + 8 ) + ... + ( 1997 - 1998 - 1999 + 2000 ) + 2001

= 0 + 0 + ... + 0 + 2001

= 2001

1.Choose and write negative sentences.

do            eat            ride               wear             read             sleep               swim

1. The boys ...doesn't eat ...their lunch.They aren't hungry.
2.You ...don't do..your homework! You're hungry.
3. She ...doesn't listen ...to music. She's writing an e-mail.
4. He ...doesn't ride ...his bike.He's skating.
5. The cat ...doesn't sleep.... It's playing in the garden.
6. I ...don't read ...your magazine. This is my magazine.
7. They ...don't swim... in the sea. It's very cold.
 

1.Choose and write negative sentences.

do            eat            ride               wear             read             sleep               swim

1.Brian.....isn't wearing......his glasses today.

1.The boys.......aren't eating.....................their lunch. They aren't hungry.

3.You...............aren't doing.....................your homeworld! You're watching Tv!

4.She.........isn't listening................to music.She's writing an e-mail.

5.He...............isn't ride................his bike. He's skating

6.The cat............isn't sleeping..................... .It's playing in the garden.

7.I............amnot reading........................your magazine. This is my magazine.

8. They...........aren't swimming...................in the sea. It's very cold.

e ơi cái này thì HTĐ hay HTTD hay gì thế, cho chj xin đề bài ạ

1.Look read and write

1.the girl / take / a / photo? ....Is the girl taking a photo?....                ...Yes, she is...........

2.the dogs / jump? .....Are the dogs jumping ? ..........                     ....Yes , they are .............................

3.Brian / eat / red shoes?...Is Brian eating red shoes ?....( hơi kì á )..           ........No , he isn't...............

4.Zoe / laugh?.......Is Zoe laughing ?....................                       .............Yes , she is.......................

5.the clowns / wear / red shoes?.Are the clowns wearing red shoes ?..             .Yes , they are .........................

6.the baby / look at the clowns?...Is the baby looking at the clowns ?      ........Yes , he is...( baby phụ thuộc vào g.tính  )........  

7.the mice / sleep?.......Is the mice sleeping ?........                                 .......No , it isn't 

8.the cat / run?............Is the cat running ?.................                   ...................No , it isn 't .........

1.Are we studying English?                          ............Yes, we are.................

2.Are you wearing a T-shirt?                        ................No we aren't...............................

3.Are your friends playing basketball?         ....................................No we aren't............

4.Are we looking at our books?                  ...................Yes ,we are............................

5.Are your mum and dad working?             .....................Yes,they are..........................

6.Are you listening to your teacher?            .....................No,I am not..........................

1.What's happening now? Write true answers.

1.Are we studying English?                          ............Yes, we are studing.................

2.Are you wearing a T-shirt?                        ...................No , I amnot wearing............................

3.Are your friends playing basketball?         .....................Yes , they're playing...........................

4.Are we looking at our books?                  ...................Yes , we are looking............................

5.Are your mum and dad working?             ....................No , they aren't working..........................

6.Are you listening to your teacher?            ...................Yes , I am listening ...........................

* Bạn sd cấu trúc câu phủ định của thì hiện tại tiếp diễn 

2.We're doing our homework-Positive

We aren't playing our basketball-Negative

3.They're eating ice cream-Positive

They aren't drinking ice cream-Negative

4. You're talking to your friend-Positive

You aren't listening to me-Negative

5.You're flying-Positive

You aren't walking-Negative

Positive                                                                                      Negative

1.(read)                                                                                  1.(watch)

I....'m reading........a book.                                                       I....'m not watching.......Tv

2 (do)                                                                                     2.(play)

We.........are doing.................our homework.                                          We.........'re not playing.....................basketball

3.(eat)                                                                                    3.(drink)

They.........are eating.............ice cream.                                                   They........'re not drinking......................orange juice.

4.(talk)                                                                                     4.(listen)

You.........are talking..................to your friend.                                          You........'re not listening..............................to me.

5.(fly)                                                                                       5.(walk)

You......are flying..............................                                                      You.........'re not walking........................................