Đúng:b

Sai:a,c,d

Câu này tớ chưa từng gặp

Mới tra google nên ra câu a mới đúng

Minsk

Minsk 

\(M=2\left(x^3-y^3\right)-3\left(x^2+2xy+y^2\right)\)

\(=2\left[\left(x-y\right)^3+3xy\left(x-y\right)\right]-3\left(x^2-2xy+y^2+4xy\right)\)

\(=2.\left[\left(x-y\right)^3+3xy\left(x-y\right)\right]-3\left[\left(x-y\right)^2+4xy\right]\)

Thay \(x-y=2\)vào biểu thức ta được:

\(M=2.\left(2^3+3xy.2\right)-3\left(2^2+4xy\right)=2.\left(8+6xy\right)-3.\left(4+4xy\right)\)

\(=16+12xy-12-12xy=4\)

Các bạn sửa lại từ nay cho mk nha

Câu 4: Sai: Sgow  => Đúng: Show

1. What is the new weatherman's name ?                            4. When does the game sgow begin ? - At 8 p.m. I think

2. Which of these channels do you most ?                    5. How often does your father watch TV? - Twice a day

3. Where did you leave before the progamme ended ?       6. Who is your favourite MC ?

lm trên symbolab.com (thêm simplify là ra)

\(\sqrt{2x-2\sqrt{x^2-4}}+\sqrt{x-2}=\sqrt{\left(\sqrt{x-2}-\sqrt{x+2}\right)^2}+\sqrt{x-2}\)

\(=\left|\sqrt{x-2}-\sqrt{x+2}\right|+\sqrt{x-2}\)

\(=-\sqrt{x-2}+\sqrt{x+2}+\sqrt{x-2}\)

\(=\sqrt{x+2}\)

\(56,58=\frac{5658}{1000}=\frac{2829}{500}\)

HOKTOT

\(56,58=\frac{5658}{100}=\frac{2829}{50}\)

 Hk Tốt ~

Nếu là điền dấu thì 2000400 < 4578998

2000400 < 4578998

`~Học tốt~

Answer:

1. Pho is the most delicious food I've ever tasted

2. Ho Chi Minh City is busier than Ha Noi

3. Vaan City is the smallest country in the world

1. most deliciuos

2. busier 

3. smallest

Complete the following sentences with comparatives .

1. Pho is the ( delicious ) most delicious food I've ever tasted .

2. Ho Chi Minh is ( busy ) busier than Ha Noi .

3. Vaan City is the ( small ) smallest Country in the world .

Học tốt

1. Pho is the most delicious food I've ever tasted.

2. Ho Chi Minh City is busier than Ha Noi.

3. Vaan City is the smallest Country in the world.