Bài 1

a) \(\dfrac{3}{8}+\dfrac{5}{8}=\dfrac{8}{8}=1\)             

b) \(\dfrac{3}{4}+\dfrac{-7}{16}=\dfrac{12}{16}+\dfrac{-7}{16}=\dfrac{5}{16}\)

c) \(2\dfrac{17}{20}-\dfrac{1}{2}+3\dfrac{3}{20}=\dfrac{57}{20}-\dfrac{1}{2}+\dfrac{63}{20}\)\(=\dfrac{47}{20}+\dfrac{63}{20}=\dfrac{110}{20}=\dfrac{11}{2}\)

d) \(\dfrac{2}{3}-2\dfrac{1}{8}+\dfrac{7}{24}=\dfrac{2}{3}-\dfrac{17}{8}+\dfrac{7}{24}=\dfrac{16}{24}-\dfrac{51}{24}+\dfrac{7}{24}=\dfrac{16-51+7}{24}=\dfrac{-28}{24}=\dfrac{-7}{6}\)

Bài 2 :

a) \(x-\dfrac{7}{4}=3\)

\(x=3+\dfrac{7}{4}\)

\(x=\dfrac{19}{4}\)

b) \(x-\dfrac{1}{2}=\dfrac{4}{16}\cdot\dfrac{8}{3}\)

   \(x-\dfrac{1}{2}=\dfrac{2}{3}\)

  \(x=\dfrac{2}{3}+\dfrac{1}{2}\)

 \(x=\dfrac{5}{6}\)

c) \(\dfrac{15}{11}\div x=\dfrac{45}{22}\)

             \(x=\dfrac{15}{11}\div\dfrac{45}{22}\)

            \(x=\dfrac{2}{3}\)

d) \(\dfrac{8}{3}-2x=\dfrac{8}{5}-1\)

    \(\dfrac{8}{3}-2x=\dfrac{3}{5}\)

           \(2x=\dfrac{8}{3}-\dfrac{3}{5}\)

           \(2x=\dfrac{31}{15}\)

            \(x=\dfrac{31}{15}\div2\)

           \(x=\dfrac{31}{30}\)

41 D

42 C

43 B

44 A

45 B

46 D

47 B

48 B

49 B

50 A

d c b a b

d b b b a

giải cái gì bạn

42

bố 42 con 12

42 tuổi

Câu 1: She doesn't live in London because she doesn't know anyone there

->She'd.....live in London if she knew anyone there ......................................................................................................

Câu 2: I can't live in the country because I can't find a job there

->I'd...........live in the country if I could find a job there..............................................................................

Câu 3: I don't have a spare ticket. I can;t take you to the concert

->If I.........had a spare ticket, I could take you to the concert.................................

Câu 4: The schoolchildren sowed some seed, but they forgot to water them so they didn't go

-> If the children .....hadn't forgot to water the seeds, they would have grown................................

Câu 5: They don't understand a problem. They won't find a solution

-> If they...

Câu 6:He sit too much. He isn't fit

-> If he........didn't sit too much, he would be fit.....

ảnh nhỏ quá bạn

Câu 1: She doesn't live in London because she doesn't know anyone there

->She'd...........................................................................................................

Câu 2: I can't live in the country because I can't find a job there

->I'd..........................................................................................

Câu 3: I don't have a spare ticket. I can;t take you to the concert

->If I..........................................

Câu 4: The schoolchildren sowed some seed, but they forgot to water them so they didn't go

-> If the children .....................................

Câu 5: They don't understand a problem. They won't find a solution

-> If they...

Câu 6:He sit too much. He isn't fit

-> If he.............

1. How much is this watch?

2. How much are these beautiful scarves?

3. Can you tell me how to get to Dong Nai post office?

4. Can you tell me how to get to the station?

5. Peter works hard

6. There aren't any bottles on the shelf

7. We don't have time to prepare the speech

27 will come

28 show

29 owns

30 called

31 has seen

32 have seen

33 was having - knocked

34 left - became

35 took

36 haven't met - got

37 was

38 are preparing

39 stayed - rode - had borrowed

40 visited

41 has worked

42 worked

43 build - fly

44 have lost

45 are moulding

46 arrived

47 have - been

48 Have - received

49 had left

5 saw