Choose the word which has the underlined part pronounced differently from the rest.

A. calm

B. would

C. folk

D. help

Read the passage and complete the statements below:

Her name is Lan. She lives in a house in the city. Near her house, there is a supermarket, a bank, a post office and a clinic. She is a student. She studies at Le Quy Don School. Her house is far from her school so she often goes to school by bike. She goes to school in the afternoon. There is a park in front of the school. There are a lot of trees and flowers in the park. Behind the school, there is a river.

She studies at ……………………………

1.\(\left(-3\right)\times\left(-5\right)^2\)

\(=\left(-3\right)\times25\)

\(=-75\)

2. Kết luận D.-|-2|=2 là kết luận đúng

3.Giá trị của biểu thức sau:

\(\left|x-1\right|+x+2\) với \(x=-3\)

* Ta có:

\(\left|\left(-3\right)-1\right|+\left(-3\right)+2\)

\(=\left|\left(-3\right)-1\right|+-1\)

\(=3+1+\left(-1\right)\)

\(=4+\left(-1\right)\)

\(=3\)

Vậy giá trị của biểu thức trên là 3

Ví dụ về ứng dụng của đòn bẩy trong cuộc sống:

+ Búa nhổ đinh

+ Cái cần câu cá

+ Cái kéo

+Cái bấp bênh

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