K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

14 tháng 1 2022

1. have waited

2. has written

3. has studied

4. has finished

5 haven't done

6. We don't go to school on Saturdays

7. They usually hold a party on New Year's Eve

8. I have seen this film already

9. Last night she came home between 10.30 and 11 o'clock

10. We are going to see the movie Dream City at 7.00 this evening

14 tháng 1 2022

1 have waited

2 has written

3 has studied

4 has finished

5 haven't done

6 We don't go to school on Saturdays.

7 They usually hold a party in New Year's Eve.

8 I've seen this film already.

9 Last night, she came home between 10.30 and 11 o'clock.

10 We are going to see the movie Dream City at 7.00 this evening.

8 tháng 12 2021

\(ĐK:x\ne\dfrac{1}{2};x\ne1;x\ne\dfrac{3}{2};x\ne2;x\ne\dfrac{5}{2}\\ PT\Leftrightarrow\dfrac{1}{\left(2x-1\right)\left(x-1\right)}+\dfrac{1}{\left(x-1\right)\left(3x-2\right)}+\dfrac{1}{\left(3x-2\right)\left(x-2\right)}+\dfrac{1}{\left(x-2\right)\left(5x-2\right)}=\dfrac{4}{21}\\ \Leftrightarrow2\left[\dfrac{\dfrac{1}{2}}{\left(x-\dfrac{1}{2}\right)\left(x-1\right)}+\dfrac{\dfrac{1}{2}}{\left(x-1\right)\left(x-\dfrac{3}{2}\right)}+\dfrac{\dfrac{1}{2}}{\left(x-\dfrac{3}{2}\right)\left(x-2\right)}+\dfrac{\dfrac{1}{2}}{\left(x-2\right)\left(x-\dfrac{5}{2}\right)}\right]=\dfrac{4}{21}\)

\(\Leftrightarrow\dfrac{1}{x-1}-\dfrac{1}{x-\dfrac{1}{2}}+\dfrac{1}{x-\dfrac{3}{2}}-\dfrac{1}{x-1}+\dfrac{1}{x-2}-\dfrac{1}{x-\dfrac{3}{2}}+\dfrac{1}{x-\dfrac{5}{2}}-\dfrac{1}{x-2}=\dfrac{2}{21}\\ \Leftrightarrow\dfrac{1}{x-1}-\dfrac{1}{x-\dfrac{5}{2}}=\dfrac{2}{21}\\ \Leftrightarrow\dfrac{x-\dfrac{5}{2}-x+1}{\left(x-1\right)\left(x-\dfrac{5}{2}\right)}=\dfrac{2}{21}\\ \Leftrightarrow\dfrac{-\dfrac{3}{2}}{x^2-\dfrac{7}{2}x+\dfrac{5}{2}}=\dfrac{2}{21}\\ \Leftrightarrow x^2-\dfrac{7}{2}x+\dfrac{5}{2}=-\dfrac{63}{4}\\ \Leftrightarrow4x^2-14x+10=-63\\ \Leftrightarrow4x^2-14x+73=0\\ \Leftrightarrow x\in\varnothing\)

2 tháng 1 2022

b d a d b

2 tháng 1 2022

cj giỏi tiếng anh th ấy:<

2 tháng 1 2022

a c b d a c

2 tháng 1 2022

c d b d

2 tháng 1 2022

d d c b b b

2 tháng 1 2022

c c d d a

2 tháng 1 2022

d d b c a c

2 tháng 1 2022

19 d

20 d

21 b

22 c

23 a

24 c

2 tháng 1 2022

d b d b c c

2 tháng 1 2022

9 d

10 b

11 d

12 b

13c

14 c