Mẹ em hát rất hay.

Em và bạn em hay cãi nhau.

Khi học xong em hay đi chơi.

b)ra là 3-3/4+3/4-3/7+3/7-3/10+...+3/43-3/46=3-3/46=135

d)s=8+7^2+7^3+...+7^99=1+7+7^2+7^3+...+7^99

7s=7+7^2+7^3+7^4+...+7^100

7s-s=7^100-1

s=(7^100-1)/6

12. điền vào chỗ ... chữ "by"

13. were used

14. was opened

15. is visited by

16. is known

14 B

15 B

16 D

17 A

18 A

19 A

20 A

14.A

15.B

16.D

17.A

18.A

19.A

20.A

chụp rõ hơn chút bn

21. didn’t go

22. isn’t painting

23. aren’t planting

24. Are they making

25. is repairing

26. is taking

27. is explaining

28. is studying

29. tries/ don’t think

30. passes

21. didn’t go

22. isn’t painting

23. aren’t planting

24. Are they making

25. is repairing

26. is taking

27. is explaining

28. is studying

29. tries/ don’t think

30. passes

\(a,\left(d\right)\text{//}\left(d'\right)\Leftrightarrow\left\{{}\begin{matrix}m+1=-m+8\\2m\ne-6\end{matrix}\right.\Leftrightarrow m=\dfrac{7}{2}\\ b,\Leftrightarrow\left\{{}\begin{matrix}m+2\ne-m+8\\2m=-6\end{matrix}\right.\Leftrightarrow m=-3\\ c,\text{Gọi điểm cố định mà }\left(d'\right)\text{ đi qua với mọi }m\ne8\text{ là }A\left(x_0;y_0\right)\\ \Leftrightarrow y_0=\left(8-m\right)x_0+2m\\ \Leftrightarrow mx_0-8x_0-2m+y_0=0\\ \Leftrightarrow m\left(x_0-2\right)+\left(y_0-8x_0\right)=0\\ \Leftrightarrow\left\{{}\begin{matrix}x_0-2=0\\y_0-8x=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x_0=2\\y_0=16\end{matrix}\right.\\ \Leftrightarrow A\left(2;16\right)\\ \text{Vậy đt đi qua }A\left(2;16\right),\forall m\ne8\)

26C 27A 28A 29C 30D

31 she is a teacher

32 she is tall

33 is coming

34 to sit

35 is going to have

36 is fatter than her mother

37 is this book

38 oranges would you like

39 go fishing

40 fly to Hong Kong

26 C

27 A

28 A

29 C

30 D

31 She is a teacher

32 She is tall

33 is coming

34 to sit

35 is going to have

36 My father is fatter than my mother

37 How much is this book?

38 How many oranges would you like?

39 Let's go fishing

40 Lam always flies to Hong Kong

Ở đâu

4:

h: -(x-9)(2x-1)

=-(2x^2-x-18x+9)

=-2x^2+19x-9

k: -(2x+3)(x-7)

=-(2x^2-14x+3x-21)

=-2x^2+11x+21

l: -(6x+1)(5x-9)

=-(30x^2-54x+5x-9)

=-30x^2+49x+9

m: =(2x-5)(7x-3)

=14x^2-6x-35x+15

=14x^2-41x+15

n: =(6x-8)(x-9)

=6x^2-54x-8x+72

=6x^2-62x+72

5:

a: \(=2x^3-2x^2+2x+3x^2-6x+24x-48-5x-5\)

=2x^3+x^2+15x-5

b: \(=4x^2+20x+2x^2+14x-6x-42-15x+27\)

=6x^2+13x-15

c: \(=-7x^2+14x+2x^2-4x+10x-20-3x^2+3x\)

=-8x^2+23x-20

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