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16 tháng 3 2022

\(CC'\perp AB\) , mà CC' có 1 vtpt là (3;8) nên đường thẳng AB nhận (8;-3) là 1 vtpt

Phương trình AB có dạng:

\(8\left(x+1\right)-3\left(y+3\right)=0\Leftrightarrow8x-3y-1=0\)

B là giao điểm BB' và AB nên tọa độ thỏa mãn:

\(\left\{{}\begin{matrix}5x+3y-25=0\\8x-3y-1=0\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}x=2\\y=5\end{matrix}\right.\)

\(\Rightarrow B\left(2;5\right)\)

15 tháng 3 2022

1 công cụ bằng kim khí xuất hiện

16 tháng 3 2022

Không phải là do năng suất lao động tăng à bạn?

ơ gái hay cái vậy ????????????

thế mờ lại ghi là ggai

1. He hardly goes to school by bike, ?2. Your name is Thao, ?3. The rich usually live in big houses , ?4. He’s never met you before , ?5. Nothing matters, ?6. Nobody is going to the mosque, ?7. I’m not supposed to be here on time, ?8. Don’t be late, ?9. Have some more coffee, .?10. Your father used to work in a factory, ? 11. My father’s got a car,?12. The man doesn’t take it, ?13. We didn’t eat anything this morning, ?14. The woman takes it, ?15. There aren’t any books on the...
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1. He hardly goes to school by bike, ?

2. Your name is Thao, ?

3. The rich usually live in big houses , ?

4. He’s never met you before , ?

5. Nothing matters, ?

6. Nobody is going to the mosque, ?

7. I’m not supposed to be here on time, ?

8. Don’t be late, ?

9. Have some more coffee, .?

10. Your father used to work in a factory, ?

11. My father’s got a car,?

12. The man doesn’t take it, ?

13. We didn’t eat anything this morning, ?

14. The woman takes it, ?

15. There aren’t any books on the table, ?

16. This film looks interesting,  ?

17. Your brother must do this work,  ?

18. My dog never barks,  ?

19. You have to take a bath right away, ?

20. You’d better go and see him, ?

21. She’d like to join in the army, ?

22. Everything is ok, ?

23. Nothing can prevent him from going there, ?

24. Everyone knows him, ?

25. Nobody knew why he was absent, ?

26. Do what I have told you, ?

27. Have a glass of water, ?

28. None of my friends have come, .?

29. She can neither drive a car nor ride a bike, ?

30. You and your friends do morning exercise every day,

 

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