Bài 2

5 C

Bài 3

1 D

6 C

Còn lại ol r nhé

2) 5. C

3) 2. D

6. C

Còn lại ok nha

chữ m quá 

ll

1. đúng rồi

2. ofre

3.he=> the

Câu 1: 

Ta có: \(\left(3x+7\right)\left(2x+3\right)-\left(3x-5\right)\left(2x+11\right)\)

\(=6x^2+9x+14x+21-\left(6x^2+33x-10x-55\right)\)

\(=6x^2+23x+21-6x^2-23x+55\)

=76

Câu 5:

\(VT=\dfrac{x^2yz}{xy+x^2yz+xyz}+\dfrac{y}{yz+y+xyz}+\dfrac{z}{xz+z+1}\\ =\dfrac{xz}{1+z+xz}+\dfrac{1}{z+1+xz}+\dfrac{z}{zx+z+1}\\ =\dfrac{zx+z+1}{zx+z+1}=1\)

Câu 1:

BPNT liệt kê:"Nước tràn lênh lán,xoáy thành vực sâu,nhà cửa trôi băng,lúa má ngập hết;kẻ sống không chỗ ở,kẻ chết không nơi chôn,lênh đênh mặt nước,chiếc bóng bơ vơ,tình cảnh cảm sầu,kể sao cho xiết"

xét về cấu tạo:Liệt kê không theo cặp

Câu 2:

Câu đặc biệt: "Than ôi ! Lo thay ! Nguy thay!"

Những câu đặc biệt này có tác dụng là "bộ lộ cảm xúc"

1. Brush your teeth after meals.

2. Don't play soccer in the street

3. Wash and iron your own clothes.

4. Don't eat too much candy.

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1. She is interested in/ fond of/ keen on playing tennis.

2. No house in the street is older than my house.

3. Although the test was difficult, many students did it well. 

4. It's very important to keep the environment clean.

5. What a wonderful holiday they have!

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1. My sister is a fast runner.

2. Hoang plays football badly.

3. Linh is good at swimming.

4. Peter's favourite sport is badminton.

5. Jack is fatter than Mike.

6. Hugo is interested in playing sports in his free time.

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1. There isn't a bookshelf in my room.

2. Ha is harder than Quang.

3. What a lovely baby!

4. Viết lại bằng từ gì nhỉ?

Bài 2: 

Ta có: \(3n^3+10n^2-5⋮3n+1\)

\(\Leftrightarrow3n^3+n^2+9n^2+3n-3n-1-4⋮3n+1\)

\(\Leftrightarrow3n+1\in\left\{1;-1;2;-2;4;-4\right\}\)

\(\Leftrightarrow3n\in\left\{0;-3;3\right\}\)

hay \(n\in\left\{0;-1;1\right\}\)