16. F

17. T

18. T

19. F 

20. T

Một người có chiều cao 1,6m đứng ngay dưới ngọn đèn treo ở độ cso 4m. Người này bước đi đều với v=5,4km/h. Hãy xác định tốc độ chuyển động của bóng đỉnh đầu.

Chứng minh rằng nếu ta có đẳng thức:

\(a\left(b-c\right)x^2+b\left(c-a\right)xy+c\left(a-b\right)y^2=d\left(x-y\right)^2\) trong đó \(a,b,c\ne0\) đúng với mọi x và y thì: \(\frac{1}{a}+\frac{1}{c}=\frac{2}{b}\)

1. If you have time, come to visit our Bac Giang city. I'll show you __________ .

2. My hotel was amazing and it lived up _________ all my expectation.

3. They can’t buy the car. It’s ___________ their reach.

4. Finally, the riot was brought ___________ control.

5. We should provide any child ___________ a chance to go to school.

6. The doctors say it takes him a long time to get _________ the shock.

7. When he was younger, he used to play badminton _________ my local team.

8. She is decorating a cloth picture with a pattern __________ stitches, using coloured threads.

9. In the past the whole village used to listen to the news programme ________ a loudspeaker.

10. She doesn't get ________ well with her new classmates.

x - 100 = 200 + 100

=> x = 200 + 100 + 100

=> x = 300 + 100

=> x = 400