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a: \(x=\dfrac{5}{14}:\dfrac{6}{7}=\dfrac{5}{14}\cdot\dfrac{7}{6}=\dfrac{5}{12}\)

b: \(x=\dfrac{4}{9}\cdot\dfrac{2}{3}=\dfrac{8}{27}\)

c: \(\dfrac{6}{x}=\dfrac{3}{4}:\left(\dfrac{3}{8}\cdot\dfrac{5}{4}\right)=\dfrac{3}{4}:\dfrac{15}{32}=\dfrac{3}{4}\cdot\dfrac{32}{15}=\dfrac{8}{5}\)

nên x=30/8=15/4

d: \(\Leftrightarrow x\cdot\dfrac{1}{3}=\dfrac{24}{315}\cdot\dfrac{7}{4}=\dfrac{2}{15}\)

nên x=2/5

27 tháng 6

1.I think you ought to give up playing video games. (should)

-->I think you should give up playing video games.

2.It's necessary for me to finish the work on time. (have to)

--->I have to finish the work on time.

3.It wasn't necessary for you to clean that car. (have to)

--->You didn't have to clean that car.

4.It was quite unnecessary for you to adopt a green lifestyle. (have to)

---->You didn't have to adopt a green lifestyle.

5.It was careless of you to leave the windows open last night. (shouldn't)

----->You shouldn't have left the windows open last night.

6.It is advisable for each member in the family to share the housework equally. (should)

---->Each member in the family should share the housework equally.

7.You are required to come back home before 10 p.m. (must)

--->You must come back home before 10 p.m.

8.Lina is advised to prepare carefully in the morning. (should)

----->Lina should prepare carefully in the morning.

9.Tu is responsible for picking up litter. (have to)

------>Tu has to pick up litter.

27 tháng 6

1.You are required to ask your parents for permission before staying out late. (must)

You must ask your parents for permission before staying out late.

2.I think you ought to give up smoking immediately. (should)

I think you should give up smoking immediately.

3.It is not a good idea for me to stay up late. (shouldn't)

I shouldn't stay up late.

4.It wasn't necessary for you to send these letters. (have to)

You didn't have to send these letters.

5.It was unnecessary for Tim to finish the work. (have to)

Tim didn't have to finish the work.

6.It was careless of you to leave your children alone at home. (shouldn't)

You shouldn't have left your children alone at home.

Bằng 1 cách nào đó 1 câu hỏi từ 2023 ở đây và tôi vẫn trả lời nó sau 1 năm :v

12 tháng 7

16, a

17, a

18, d

19, a

20, b

21, c

28 tháng 4 2022

17 B: (động vật hoang dã)

19 A:(khí hậu mưa)

20 B(bị động và expect+to-v)

21 C(động lực)

24 tháng 5 2021

III. 

A. 

1. B

2. C

3. B

4. A

5. D

B. 

1. C

2. B

3. B

4. A

5. C

18 tháng 11 2021

1 b c b a d

2 c b b a c nha

25 tháng 5 2021

Đề dài thế này sao giải thích nhanh cho e đc

Part 1

1 C

2 B

3 D

4 C

5 B

6 A

Part 2

1 T

2 F

3 F

4 F

V

1 That old house has just been bought

2 If he doesn't take these pills, he won't be better

3 I suggest taking a train

4 Spending the weekend in the countryside is very wonderful

 

3 tháng 8 2021

nhiều thật đấy

5 tháng 5 2023

A = 1/(5.6) + 1/(6.7) + ... + 1/(24.25)

= 1/5 - 1/6 + 1/6 - 1/7 + ... + 1/24 - 1/25

= 1/5 - 1/25

= 4/25

B = 2/(1.3) + 2/(3.5) + 2/(5.7) + ... + 2/(99.101)

= 1 - 1/3 + 1/3 - 1/5 + 1/5 - 1/7 + ... + 1/99 - 1/101

= 1 - 1/101

= 100/101

5 tháng 5 2023

`a) A = 1/(5.6) + 1/(6.7)+...+1/(24.25)`

`= 1/5 - 1/6 + 1/6 - 1/7 +...+1/24-1/25`

`= 1/5-1/25`

`= 5/25 - 1/25`

`= 4/25`

Vậy:`A = 4/25`

`b) B = 2/(1.3)+2/(3.5)+...+2/(99.101)`

`= 1- 1/3 + 1/3 - .... +1/99-1/101`

`= 1 - 1/101`

`= 100/101`

Vậy: `B = 100/101`

21 tháng 3 2022

Nhiều quá 20 câu lận

21 tháng 3 2022

Giúp mình 10 câu cũng đc ạ

8 tháng 1 2022

working

directly

8 tháng 1 2022

best English nha

14 tháng 3 2022

Ta có:

     (2 - 3x)(x + 8) = (3x - 2)(3 - 5x)

⇔ (2 - 3x)(x + 8) - (3x - 2)(3 - 5x) = 0

⇔ (2 - 3x)(x + 8) + (2 - 3x)(3 - 5x) = 0

⇔ (2 - 3x)(x + 8 + 3 - 5x) = 0

⇔ (2 - 3x)(11 - 4x) = 0

⇔ 2 - 3x = 0 hay 11 - 4x = 0

⇔ 2 = 3x hay 11 = 4x

⇔ x = \(\dfrac{2}{3}\) hay x = \(\dfrac{11}{4}\)

Vậy tập nghiệm của pt S = \(\left\{\dfrac{2}{3};\dfrac{11}{4}\right\}\)

14 tháng 3 2022


<=> (2-3x ) (x+8) + (2-3x ) (3-5x)=0
<=> (2-3x ) ( x+8 +  3-5x ) =0 
<=> (2-3x ) ( 11 - 4x ) = 0
 => 2-3x  =0 hoặc 11-4x =0  
       3x = 2            4x =11
         x = 2/3         x    = 11/4

27 tháng 8 2021

lỗi latex=copy

27 tháng 8 2021

`81^8=3^x`

`=>3^x=(3^4)^8`

`=>3^x=3^32`

`=>x=32`

Vậy `x=32`