39x11+25x11 =(39+25)x11                                   

=64x11

=704

   67x11+58x11=(67+58)x11

  =125x11

=1375

39x11- 27x11

=(39-27)x11

=12x11

=132

Câu tự lấy ví dụ nhé

1) 39 x 11 + 25 x 11

  = 11 x ( 39 + 25 ) = 11 x 64 = 704

    67 x 11 + 58 x 11

  = 11 x ( 67 + 58 ) = 11 x 125 = 1375

   39 x 11 - 27 x 11

  = ( 39 - 27 ) x 11 = 12 x 11 = 132

a, ( x - 21 x 13 ) : 11 = 39                   Tich mk cau b) ti nua mk lam cho gio phai di hoc them rui

     x - 273                = 39 x 11

     x - 273                = 429

     x                        = 429 + 273

     x                        = 702

a, ( x - 21 x 13 ) : 11 = 39                                                        b, ( x - 21 ) x 13 : 11 = 39

( x - 21 x 13 ) = 39 x 11                                                               ( x - 21 ) x 13        = 39 x 11

( x - 21 x 13 ) = 429                                                                     ( x - 21) x 13         = 429

x - 273           = 429                                                                      ( x - 21 )              = 429 : 13

      x              = 429 + 273                                                             ( x - 21 )             = 33

      x              =  702                                                                       x                        = 33 + 21

                                                                                                       x                        = 54

Mình nhầm, 11x.....-11x39=495

Gọi x là số cần tìm

\(\Rightarrow11\times x-11\times39=495\)

\(11\times\left(x-39\right)=495\)

\(x-39=495:11\)

\(x-39=45\)

\(x=45+39\)

\(x=84\)

Vậy số cần tìm là 84

45/11

=45/11

45/11

9 Did you go - went - didn't enjoy

10 did - die

11 didn't invite - didn't go

12 Did you have - didn't

13 didn't do

did-go out-went-didn't enjoy

did-đi

didn't invited-didn't go

did-have-didn't

didn't do

11. 'Ann is in hospital.' 'Yes, I know. .......... her tomorrow.' 

a. I visit b. I'm going to visit c. I'll visit 

12. 'It's my birthday soon................twenty next Friday." Oh, really? .......... a party?' 

a. I'm going to be; Are you having b. I am! Will you have 

c. I'll be/ Are you going to have 

13.' it's a public holiday next Monday.' 'Yes, I know.......... anything special?' 

a. Are you doing b. Do you do c. Will you do 

14. 'Would you like to join Linda and me tomorrow? We.......... the natural 
history museum.' 'Sure. I've never been there.' 

a. visit b. will visit c. are going to visit, 

15.‘ I've decided to try and learn a foreign  language ."Have you? Which language....................?' 

a. will you learn b. are you going to learn  c. are you learning  

16. My parents ........will come...... tomorrow to stay with me for a few days. 

a. come b. will have come  c. are commit d. came 

17. I'll return Bob's pen to him the next time I.............him. 

a. see b. will see c. I'm going to see  d. have seen 

18. The firework display, part of the city's centenary celebration,.......... place on the 21st August in Cannon Park. 

a. will take b. is taking c. is going to take  d. takes 

19. This is the first time we..............to Scotland so it's all new to us. 

a. are going b. Were c. have been d. will go 

20. Look at those cars! They................! 

a. will crash b. are crashing c. will be crashed  d. are going to crash 

21.  We hope the excursion will help us a lot after working hard. 

a. relax b. relaxing e. relaxed d. be relaxed 

22. Goodnight. I.................  you in the morning. 

a. see b. am seeing, c. am going to see  d. will see.  

23.  What's in the letter? Why........don't you let me read it........... 

a. don't you let me to read it b. don't you let me reading it 

c. won't you let rue read it d. won't you let me to read it 

24. Only in this house ................safe and secure. 

a. I feel b. do I feel c. I do feel d. feel 1 

25. Hurry. The next bus.....................at 7:15. 

a. leave b. leaves c. is leaving d. will leave 

26. Nobody can persuade her.....................her mind. 

a. change b. to change c. changing d. changed 

27. 'We're having a party at the weekend' 'Great! Who........................ 

   a. will being invited b. is going to invite 

c. is going to be .invited d. will invite 

28. I'll give you a map................. 

a. in order for you find the way all right. 

b. so that you will find the way all right. 

c. in order that you can find the way all right. 

d. b and c are all correct. 

29. He was busy ................. his homework. 

a. doing b. to do c. that he was doing d. he was doing 

30. 'Are Alice and Tom still living in New York? "No, they....................to Dallas,' 

a. are moving.  b. had already moved 

c. have just moved d. will moved 

11.   'Which of his sons inherited his estate?' asked another.         

…Another asked which of his sone had inherited his estate ………………………………………………………………………

12.   'Who is going to live in the big house?' enquired a third. 

…………A third inquired who was going to live in the big house………………………………………………………………

13.   'What will happen to his racehorses?' asked someone else.

……Some else asked what would happen to his racehorses……………………………………………………………………    

14.   'Which team has won?' asked Ann.                               

……Ann asked which team had won……………………………………………………………………

15.   'Which team won the previous match?' said Bill.

…………Bill asked which team had won the previous match………………………………………………………………          

16.   'Who is playing next week?' he asked.

………He asked who was playing the next week…………………………………………………………………                             

17.   'Who will be umpiring that match?' asked Tom.

………Tom asked who would be umpiring that match …………………………………………………………………

18.   'Who wants a lift home?' said Ann.

…………Ann asked who wanted a lift home………………………………………………………………                             

19.   'Who has just dropped a $10 note?' I asked.

      …I asked who had just dropped a $10 note………………………………………………………………………

\(\Leftrightarrow\dfrac{46}{39}-\dfrac{33}{39}=\dfrac{46-33}{39}=\dfrac{13}{39}=\dfrac{1}{13}\)

= \(\dfrac{1}{13}\)

= 1/13