5+5=1+9=2+8=3+7=4+6=6+4=7+3=8+2=9+1=11-1=12-2=13-3=14-4=15-5=16-6=17-7=18-8=19-9=20-10=1.10=2.5=100/10=....................................=10

1. Chọn đáp án đúng:

1. I have ........................ cough.

a. the b. a c. an d. 0

2. Khoanh vào từ có phat âm của chữ cái được in đậm:

1. a. hat b. cat c. small d. have

2. a cloudy b. house c. about d. four

3. a. windy b. rice c. nice d. five

4. a. this b. there c. thank d. that

5. a. like b. think c. drink d. thing

Vì: \(\dfrac{x}{3}=\dfrac{y}{2}\)

\(\Rightarrow\dfrac{2x}{6}=\dfrac{5y}{10}\)

Áp dụng tính chất của dãy tỉ số bằng nhau, ta có:

\(\dfrac{2x}{6}=\dfrac{5y}{10}=\dfrac{2x+5y}{6+10}=\dfrac{32}{16}=2\)

\(\Rightarrow x=6;y=4\)

S = 1 + 3 + 3^2 + 3^3 +...+ 3^2017

S . (3 - 1) = 3 - 1 + 3^2 - 3 + 3^3 - 3^2 + ... + 3^2018 - 3^2017

S = (3^101 - 1) / 2

10

chắc bạn mới vô diễn đàn giống mình???

A

1. rises / is rising

2. will go

3. did you spend

4. doesn't rain

5. goes

6. was / received

7. is / has / wears

8. is reading / reads

9. called / wasn't / took

10. will phone

11. were / lived

12. am going to visit

13.am reading / will lend

14. is going to rain

15. is coming / has

16. have you known / knew

17. Have you ever bited / bited

18. haven't seen / are

19. hasn't finished

20. will be

21. have lived

22. haven't seen

23. will be

24. have been

25. knew

26. won't go / will stay

27. Does the film begin

28. went

29. will the next train leave

30. hasn't visited / moves

31. Do you speak

32. gets

33. are going to have

B

1. is sleeping

2. sets

3. goes

4. doesn't rain

5. are having

6. drinks

7. returns

8. is writing

9. is coming

10. moves

11. smells

x(x-2)=15

x²−2x=15

x²−2x−15=0

(x−5)(x+3)=0

=> x-5=0 hoặc x+3=0

=> x = 5 hoặc -3