Trong các đại lượng sau đây, đại lượng nào không phải là thông số trạng thái của một lượng khí?

A. Thể tích

B. Khối lượng

C. Nhiệt độ tuyệt đối

D. Áp suất

Nêu ví dụ chứng tỏ giữa các phân tử có lực hút , lực đẩy.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

He felt very sorry. He didn’t see Daisy on her trip to London.

A. He greatly wished not seeing Daisy on her trip to London. 

B. He greatly wished he had not seen Daisy on her trip to London. 

C. He greatly regretted not to see Daisy on her trip to London. 

D. He greatly regretted not having seen Daisy on her trip to London.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

The manager was suspicious ______ the shop assistant.

A. of

B. with

C. in 

D. on

Ta có:

\(\left(-3\right)^n=3^n\) nếu n chẵn

\(\left(-3\right)^n=-3^n\) nếu n lẻ

B = C - D trong đó

\(C=1+3^2+3^4+...+3^{100}\)

\(D=3+3^3+3^5+...+3^{99}\)

+ \(3C=3+3^3+3^5+...+3^{101}\)

\(2C=3C-C=3^{101}-1\Rightarrow C=\frac{3^{101}-1}{2}\)

+ \(3D=3^2+3^4+3^6+...+3^{100}\)

\(2D=3D-D=3^{100}-3\Rightarrow D=\frac{3^{100}-3}{2}\)

=> \(B=C-D=\frac{\left(3^{101}-1\right)-\left(3^{100}-3\right)}{2}=\frac{\left(3^{101}-3^{100}\right)+2}{2}=\frac{3^{100}\left(3-1\right)+2}{2}=\frac{2\left(3^{100}+1\right)}{2}=3^{100}+1\)